This is zsh.info, produced by makeinfo version 4.5 from ./zsh.texi.

INFO-DIR-SECTION Utilities
START-INFO-DIR-ENTRY
* ZSH: (zsh).                     The Z Shell Manual.
END-INFO-DIR-ENTRY


File: zsh.info,  Node: TCP Functions,  Next: TCP Parameters,  Up: TCP Function System

TCP User Functions
==================

Basic I/O
---------

tcp_open [-qz] HOST PORT [ SESS ]
tcp_open [-qz] [ -s SESS | -l SESS,... ] ...
tcp_open [-qz] [-a FD | -f FD ] [ SESS ]
     Open a new session.  In the first and simplest form, open a TCP
     connection to host HOST at port PORT; numeric and symbolic forms
     are understood for both.

     If SESS is given, this becomes the name of the session which can be
     used to refer to multiple different TCP connections.  If SESS is
     not given, the function will invent a numeric name value (note
     this is _not_ the same as the file descriptor to which the session
     is attached).  It is recommended that session names not include
     `funny' characters, where funny characters are not well-defined
     but certainly do not include alphanumerics or underscores, and
     certainly do include whitespace.

     In the second case, one or more sessions to be opened are given by
     name.  A single session name is given after -s and a
     comma-separated list after -l; both options may be repeated as
     many times as necessary.  The host and port are read from the file
     .ztcp_sessions in the same directory as the user's zsh
     initialisation files, i.e. usually the home directory, but
     $ZDOTDIR if that is set.  The file consists of lines each giving a
     session name and the corresponding host and port, in that order
     (note the session name comes first, not last), separated by
     whitespace.

     The third form allows passive and fake TCP connections.  If the
     option -a is used, its argument is a file descriptor open for
     listening for connections.  No function front-end is provided to
     open such a file descriptor, but a call to `ztcp -l PORT' will
     create one with the file descriptor stored in the parameter
     $REPLY.  The listening port can be closed with `ztcp -c FD'.  A
     call to `tcp_open -a FD' will block until a remote TCP connection
     is made to PORT on the local machine.  At this point, a session is
     created in the usual way and is largely indistinguishable from an
     active connection created with one of the first two forms.

     If the option -f is used, its argument is a file descriptor which
     is used directly as if it were a TCP session.  How well the
     remainder of the TCP function system copes with this depends on
     what actually underlies this file descriptor.  A regular file is
     likely to be unusable; a FIFO (pipe) of some sort will work
     better, but note that it is not a good idea for two different
     sessions to attempt to read from the same FIFO at once.

     If the option -q is given with any of the three forms, tcp_open
     will not print informational messages, although it will in any
     case exit with an appropriate status.

     If the line editor (zle) is in use, which is typically the case if
     the shell is interactive, tcp_open installs a handler inside zle
     which will check for new data at the same time as it checks for
     keyboard input.  This is convenient as the shell consumes no CPU
     time while waiting; the test is performed by the operating system.
     Giving the option -z to any of the forms of tcp_open prevents the
     handler from being installed, so data must be read explicitly.
     Note, however, this is not necessary for executing complete sets
     of send and read commands from a function, as zle is not active at
     this point.  Generally speaking, the handler is only active when
     the shell is waiting for input at a command prompt or in the vared
     builtin.  The option has no effect if zle is not active; `[[ -o
     zle]]' will test for this.

     The first session to be opened becomes the current session and
     subsequent calls to tcp_open do not change it.  The current
     session is stored in the parameter $TCP_SESS; see below for more
     detail about the parameters used by the system.

tcp_close [-qn] [ -a | -l SESS,... | SESS ... ]
     Close the named sessions, or the current session if none is given,
     or all open sessions if -a is given.  The options -l and -s are
     both handled for consistency with tcp_open, although the latter is
     redundant.

     If the session being closed is the current one, $TCP_SESS is unset,
     leaving no current session, even if there are other sessions still
     open.

     If the session was opened with tcp_open -f, the file descriptor is
     closed so long as it is in the range 0 to 9 accessible directly
     from the command line.  If the option -n is given, no attempt will
     be made to close file descriptors in this case.  The -n option is
     not used for genuine ztcp session; the file descriptors are always
     closed with the session.

     If the option -q is given, no informational messages will be
     printed.

tcp_read [-bdq] [ -t TO ] [ -T TO ]
[ -a | -u FD ... | -l SESS,... | -s SESS ...]
     Perform a read operation on the current session, or on a list of
     sessions if any are given with -u, -l or -s, or all open sessions
     if the option -a is given.  Any of the -u, -l or -s options may be
     repeated or mixed together.  The -u option specifies a file
     descriptor directly (only those managed by this system are
     useful), the other two specify sessions as described for tcp_open
     above.

     The function checks for new data available on all the sessions
     listed.  Unless the -b option is given, it will not block waiting
     for new data.  Any one line of data from any of the available
     sessions will be read, stored in the parameter $TCP_LINE, and
     displayed to standard output unless $TCP_SILENT contains a
     non-empty string.  When printed to standard output the string
     $TCP_PROMPT will be shown at the start of the line; the default
     form for this includes the name of the session being read.  See
     below for more information on these parameters.  In this mode,
     tcp_read can be called repeatedly until it returns status 2 which
     indicates all pending input from all specified sessions has been
     handled.

     With the option -b, equivalent to an infinite timeout, the function
     will block until a line is available to read from one of the
     specified sessions.  However, only a single line is returned.

     The option -d indicates that all pending input should be drained.
     In this case tcp_read may process multiple lines in the manner
     given above; only the last is stored in $TCP_LINE, but the
     complete set is stored in the array $tcp_lines.  This is cleared
     at the start of each call to tcp_read.

     The options -t and -T specify a timeout in seconds, which may be a
     floating point number for increased accuracy.  With -t the timeout
     is applied before each line read.  With -T, the timeout applies to
     the overall operation, possibly including multiple read operations
     if the option -d is present; without this option, there is no
     distinction between -t and -T.

     The function does not print informational messages, but if the
     option -q is given, no error message is printed for a non-existent
     session.

     A return value of 2 indicates a timeout or no data to read.  Any
     other non-zero return value indicates some error condition.

     See tcp_log for how to control where data is sent by tcp_read.

tcp_send [-nq] [ -s SESS | -l SESS,... ] DATA ...
tcp_send [-nq] -a DATA ...
     Send the supplied data strings to all the specified sessions in
     turn.  The underlying operation differs little from a `print -r'
     to the session's file descriptor, although it attempts to prevent
     the shell from dying owing to a SIGPIPE caused by an attempt to
     write to a defunct session.

     The option -n prevents tcp_send from putting a newline at the end
     of the data strings.

     The remaining options all behave as for tcp_read.

     The data arguments are not further processed once they have been
     passed to tcp_send; they are simply passed down to print -r.

     If the parameter $TCP_OUTPUT is a non-empty string and logging is
     enabled then the data sent to each session will be echoed to the
     log file(s) with $TCP_OUTPUT in front where appropriate, much in
     the manner of $TCP_PROMPT.


Session Management
------------------

tcp_alias [-q] ALIAS=SESS ...
tcp_alias [-q] [ ALIAS ] ...
tcp_alias -d [-q] ALIAS ...
     This function is not particularly well tested.

     The first form creates an alias for a session name; ALIAS can then
     be used to refer to the existing session SESS.  As many aliases
     may be listed as required.

     The second form lists any aliases specified, or all aliases if
     none.

     The third form deletes all the aliases listed.  The underlying
     sessions are not affected.

     The option -q suppresses an inconsistently chosen subset of error
     messages.

tcp_log [-asc] [ -n | -N ] [ LOGFILE ]
     With an argument LOGFILE, all future input from tcp_read will be
     logged to the named file.  Unless -a (append) is given, this file
     will first be truncated or created empty.  With no arguments, show
     the current status of logging.

     With the option -s, per-session logging is enabled.  Input from
     tcp_read is output to the file LOGFILE.SESS.  As the session is
     automatically discriminated by the filename, the contents are raw
     (no $TCP_PROMPT).  The option  -a applies as above.  Per-session
     logging and logging of all data in one file are not mutually
     exclusive.

     The option -c closes all logging, both complete and per-session
     logs.

     The options -n and -N respectively turn off or restore output of
     data read by tcp_read to standard output; hence `tcp_log -cn' turns
     off all output by tcp_read.

     The function is purely a convenient front end to setting the
     parameters $TCP_LOG, $TCP_LOG_SESS, $TCP_SILENT, which are
     described below.

tcp_rename OLD NEW
     Rename session OLD to session NEW.  The old name becomes invalid.

tcp_sess [ SESS [ COMMAND  ... ] ]
     With no arguments, list all the open sessions and associated file
     descriptors.  The current session is marked with a star.  For use
     in functions, direct access to the parameters $tcp_by_name,
     $tcp_by_fd and $TCP_SESS is probably more convenient; see below.

     With a SESS argument, set the current session to SESS.  This is
     equivalent to changing $TCP_SESS directly.

     With additional arguments, temporarily set the current session
     while executing the string command ....  The first argument is
     re-evaluated so as to expand aliases etc., but the remaining
     arguments are passed through as the appear to tcp_sess.  The
     original session is restored when tcp_sess exits.


Advanced I/O
------------

tcp_command SEND-OPTIONS ... SEND-ARGUMENTS ...
     This is a convenient front-end to tcp_send.  All arguments are
     passed to tcp_send, then the function pauses waiting for data.
     While data is arriving at least every $TCP_TIMEOUT (default 0.3)
     seconds, data is handled and printed out according to the current
     settings.  Status 0 is always returned.

     This is generally only useful for interactive use, to prevent the
     display becoming fragmented by output returned from the
     connection.  Within a programme or function it is generally better
     to handle reading data by a more explicit method.

tcp_expect [ -q ] [ -p VAR ] [ -t  TO | -T TO]
    [ -a | -s SESS ... | -l SESS,... ] PATTERN ...
     Wait for input matching any of the given PATTERNs from any of the
     specified sessions.  Input is ignored until an input line matches
     one of the given patterns; at this point status zero is returned,
     the matching line is stored in $TCP_LINE, and the full set of
     lines read during the call to tcp_expect is stored in the array
     $tcp_expect_lines.

     Sessions are specified in the same way as tcp_read: the default is
     to use the current session, otherwise the sessions specified by -a,
     -s, or -l are used.

     Each PATTERN is a standard zsh extended-globbing pattern; note
     that it needs to be quoted to avoid it being expanded immediately
     by filename generation.  It must match the full line, so to match
     a substring there must be a `*' at the start and end.  The line
     matched against includes the $TCP_PROMPT added by tcp_read.  It is
     possible to include the globbing flags `#b' or `#m' in the
     patterns to make backreferences available in the parameters
     $MATCH, $match, etc., as described in the base zsh documentation
     on pattern matching.

     Unlike tcp_read, the default behaviour of tcp_expect is to block
     indefinitely until the required input is found.  This can be
     modified by specifying a timeout with -t or -T; these function as
     in tcp_read, specifying a per-read or overall timeout,
     respectively, in seconds, as an integer or floating-point number.
     As tcp_read, the function returns status 2 if a timeout occurs.

     The function returns as soon as any one of the patterns given
     match.  If the caller needs to know which of the patterns matched,
     the option -p VAR can be used; on return, $var is set to the
     number of the pattern using ordinary zsh indexing, i.e. the first
     is 1, and so on.  Note the absence of a `$' in front of VAR.  To
     avoid clashes, the parameter cannot begin with `_expect'.

     The option -q is passed directly down to tcp_read.

     As all input is done via tcp_read, all the usual rules about
     output of lines read apply.  One exception is that the parameter
     $tcp_lines will only reflect the line actually matched by
     tcp_expect; use $tcp_expect_lines for the full set of lines read
     during the function call.

tcp_proxy
     This is a simple-minded function to accept a TCP connection and
     execute a command with I/O redirected to the connection.  Extreme
     caution should be taken as there is no security whatsoever and
     this can leave your computer open to the world.  Ideally, it
     should only be used behind a firewall.

     The first argument is a TCP port on which the function will listen.

     The remaining arguments give a command and its arguments to
     execute with standard input, standard output and standard error
     redirected to the file descriptor on which the TCP session has
     been accepted.  If no command is given, a new zsh is started.
     This gives everyone on your network direct access to your account,
     which in many cases will be a bad thing.

     The command is run in the background, so tcp_proxy can then accept
     new connections.  It continues to accept new connections until
     interrupted.

tcp_spam [-ertv] [ -a | -s  SESS | -l SESS,... ] CMD ...
     Execute `CMD ...' for each session in turn.  Note this executes
     the command and arguments; it does not send the command line as
     data unless the -t (transmit) option is given.

     The sessions may be selected explicitly with the standard -a, -s or
     -l options, or may be chosen implicitly.  If none of the three
     options is given the rules are: first, if the array $tcp_spam_list
     is set, this is taken as the list of sessions, otherwise all
     sessions are taken.  Second, any sessions given in the array
     $tcp_no_spam_list are removed from the list of sessions.

     Normally, any sessions added by the `-a' flag or when all sessions
     are chosen implicitly are spammed in alphabetic order; sessions
     given by the $tcp_spam_list array or on the command line are
     spammed in the order given.  The -r flag reverses the order
     however it was arrived it.

     The -v flag specifies that a $TCP_PROMPT will be output before each
     session.  This is output after any modification to TCP_SESS by the
     user-defined tcp_on_spam function described below.  (Obviously that
     function is able to generate its own output.)

     If the option -e is present, the line given as CMD ... is executed
     using eval, otherwise it is executed without any further
     processing.

tcp_talk
     This is a fairly simple-minded attempt to force input to the line
     editor to go straight to the default TCP_SESSION.

     An escape string, $TCP_TALK_ESCAPE, default `:', is used to allow
     access to normal shell operation.  If it is on its own at the
     start of the line, or followed only by whitespace, the line editor
     returns to normal operation.  Otherwise, the string and any
     following whitespace are skipped and the remainder of the line
     executed as shell input without any change of the line editor's
     operating mode.

     The current implementation is somewhat deficient in terms of use
     of the command history.  For this reason, many users will prefer
     to use some form of alternative approach for sending data easily
     to the current session.  One simple approach is to alias some
     special character (such as `%') to `tcp_command -'.

tcp_wait
     The sole argument is an integer or floating point number which
     gives the seconds to delay.  The shell will do nothing for that
     period except wait for input on all TCP sessions by calling
     tcp_read -a.  This is similar to the interactive behaviour at the
     command prompt when zle handlers are installed.


`One-shot' file transfer
------------------------

tcp_point PORT
tcp_shoot HOST PORT
     This pair of functions provide a simple way to transfer a file
     between two hosts within the shell.  Note, however, that bulk data
     transfer is currently done using cat.  tcp_point reads any data
     arriving at PORT and sends it to standard output; tcp_shoot
     connects to PORT on HOST and sends its standard input.  Any unused
     PORT may be used; the standard mechanism for picking a port is to
     think of a random four-digit number above 1024 until one works.

     To transfer a file from host woodcock to host springes, on
     springes:

          tcp_point 8091 >output_file

     and on woodcock:

          tcp_shoot springes 8091 <input_file

     As these two functions do not require tcp_open to set up a TCP
     connection first, they may need to be autoloaded separately.


TCP User-defined Functions
==========================

Certain functions, if defined by the user, will be called by the
function system in certain contexts.  This facility depends on the
module zsh/parameter, which is usually available in interactive shells
as the completion system depends on it.  None of the functions need be
defined; they simply provide convenient hooks when necessary.

Typically, these are called after the requested action has been taken,
so that the various parameters will reflect the new state.

tcp_on_alias ALIAS FD
     When an alias is defined, this function will be called with two
     arguments: the name of the alias, and the file descriptor of the
     corresponding session.

tcp_on_close SESS FD
     This is called with the name of a session being closed and the file
     descriptor which corresponded to that session.  Both will be
     invalid by the time the function is called.

tcp_on_open SESS FD
     This is called after a new session has been defined with the
     session name and file descriptor as arguments.

tcp_on_rename OLDSESS FD NEWSESS
     This is called after a session has been renamed with the three
     arguments old session name, file descriptor, new session name.

tcp_on_spam SESS COMMAND ...
     This is called once for each session spammed, just _before_ a
     command is executed for a session by tcp_spam.  The arguments are
     the session name followed by the command list to be executed.  If
     tcp_spam was called with the option -t, the first command will be
     tcp_send.

     This function is called after $TCP_SESS is set to reflect the
     session to be spammed, but before any use of it is made.  Hence it
     is possible to alter the value of $TCP_SESS within this function.
     For example, the session arguments to tcp_spam could include extra
     information to be stripped off and processed in tcp_on_spam.

     If the function sets the parameter $REPLY to `done', the command
     line is not executed; in addition, no prompt is printed for the -v
     option to tcp_spam.

tcp_on_unalias ALIAS FD
     This is called with the name of an alias and the corresponding
     session's file descriptor after an alias has been deleted.


TCP Utility Functions
=====================

The following functions are used by the TCP function system but will
rarely if ever need to be called directly.

tcp_fd_handler
     This is the function installed by tcp_open for handling input from
     within the line editor, if that is required.  It is in the format
     documented for the builtin `zle -F' in *Note Zle Builtins:: .

     While active, the function sets the parameter TCP_HANDLER_ACTIVE
     to 1.  This allows shell code called internally (for example, by
     setting tcp_on_read) to tell if is being called when the shell is
     otherwise idle at the editor prompt.

tcp_output [ -q ] -P PROMPT -F FD -S SESS
     This function is used for both logging and handling output to
     standard output, from within tcp_read and (if $TCP_OUTPUT is set)
     tcp_send.

     The PROMPT to use is specified by -P; the default is the empty
     string.  It can contain:
    %c
          Expands to 1 if the session is the current session, otherwise
          0.  Used with ternary expresions such as `%(c.-.+)' to output
          `+' for the current session and `-' otherwise.

    %f
          Replaced by the session's file descriptor.

    %s
          Replaced by the session name.

    %%
          Replaced by a single `%'.


     The option -q suppresses output to standard output, but not to any
     log files which are configured.

     The -S and -F options are used to pass in the session name and file
     descriptor for possible replacement in the prompt.



File: zsh.info,  Node: TCP Parameters,  Next: TCP Examples,  Prev: TCP Functions,  Up: TCP Function System

TCP User Parameters
===================

Parameters follow the usual convention that uppercase is used for
scalars and integers, while lowercase is used for normal and
associative array.  It is always safe for user code to read these
parameters.  Some parameters may also be set; these are noted
explicitly.  Others are included in this group as they are set by the
function system for the user's benefit, i.e. setting them is typically
not useful but is benign.

It is often also useful to make settable parameters local to a function.
For example, `local TCP_SILENT=1' specifies that data read during the
function call will not be printed to standard output, regardless of the
setting outside the function.  Likewise, `local TCP_SESS=SESS' sets a
session for the duration of a function, and `local TCP_PROMPT='
specifies that no prompt is used for input during the function.

tcp_expect_lines
     Array.  The set of lines read during the last call to tcp_expect,
     including the last ($TCP_LINE).

tcp_filter
     Array. May be set directly.  A set of extended globbing patterns
     which, if matched in tcp_output, will cause the line not to be
     printed to standard output.  The patterns should be defined as
     described for the arguments to tcp_expect.  Output of line to log
     files is not affected.

TCP_HANDLER_ACTIVE
     Scalar.  Set to 1 within tcp_fd_handler to indicate to functions
     called recursively that they have been called during an editor
     session.  Otherwise unset.

TCP_LINE
     The last line read by tcp_read, and hence also tcp_expect.

TCP_LINE_FD
     The file descriptor from which $TCP_LINE was read.
     ${tcp_by_fd[$TCP_LINE_FD]} will give the corresponding session
     name.

tcp_lines
     Array. The set of lines read during the last call to tcp_read,
     including the last ($TCP_LINE).

TCP_LOG
     May be set directly, although it is also controlled by tcp_log.
     The name of a file to which output from all sessions will be sent.
     The output is proceeded by the usual $TCP_PROMPT.  If it is not an
     absolute path name, it will follow the user's current directory.

TCP_LOG_SESS
     May be set directly, although it is also controlled by tcp_log.
     The prefix for a set of files to which output from each session
     separately will be sent; the full filename is ${TCP_LOG_SESS}.SESS.
     Output to each file is raw; no prompt is added.  If it is not an
     absolute path name, it will follow the user's current directory.

tcp_no_spam_list
     Array.  May be set directly.  See tcp_spam for how this is used.

TCP_OUTPUT
     May be set directly.  If a non-empty string, any data sent to a
     session by tcp_send will be logged.  This parameter gives the
     prompt to be used in a file specified by $TCP_LOG but not in a
     file generated from $TCP_LOG_SESS.  The prompt string has the same
     format as TCP_PROMPT and the same rules for its use apply.

TCP_PROMPT
     May be set directly.  Used as the prefix for data read by tcp_read
     which is printed to standard output or to the log file given by
     $TCP_LOG, if any.  Any `%s', `%f' or `%%' occurring in the string
     will be replaced by the name of the session, the session's
     underlying file descriptor, or a single `%', respectively.  The
     expression `%c' expands to 1 if the session being read is the
     current session, else 0; this is most useful in ternary
     expressions such as `%(c.-.+)' which outputs `+' if the session is
     the current one, else `-'.

TCP_READ_DEBUG
     May be set directly.  If this has non-zero length, tcp_read will
     give some limited diagnostics about data being read.

TCP_SECONDS_START
     This value is created and initialised to zero by tcp_open.

     The functions tcp_read and tcp_expect use the shell's SECONDS
     parameter for their own timing purposes.  If that parameter is not
     of floating point type on entry to one of the functions, it will
     create a local parameter SECONDS which is floating point and set
     the parameter TCP_SECONDS_START to the previous value of $SECONDS.
     If the parameter is already floating point, it is used without a
     local copy being created and TCP_SECONDS_START is not set.  As the
     global value is zero, the shell elapsed time is guaranteed to be
     the sum of $SECONDS and $TCP_SECONDS_START.

     This can be avoided by setting SECONDS globally to a floating point
     value using `typeset -F SECONDS'; then the TCP functions will never
     make a local copy and never set TCP_SECONDS_START to a non-zero
     value.

TCP_SESS
     May be set directly.  The current session; must refer to one of the
     sessions established by tcp_open.

TCP_SILENT
     May be set directly, although it is also controlled by tcp_log.
     If of non-zero length, data read by tcp_read will not be written to
     standard output, though may still be written to a log file.

tcp_spam_list
     Array.  May be set directly.  See the description of the function
     tcp_spam for how this is used.

TCP_TALK_ESCAPE
     May be set directly.  See the description of the function tcp_talk
     for how this is used.

TCP_TIMEOUT
     May be set directly.  Currently this is only used by the function
     tcp_command, see above.


TCP User-defined Parameters
===========================

The following parameters are not set by the function system, but have a
special effect if set by the user.

tcp_on_read
     This should be an associative array; if it is not, the behaviour is
     undefined.  Each key is the name of a shell function or other
     command, and the corresponding value is a shell pattern (using
     EXTENDED_GLOB).  Every line read from a TCP session directly or
     indirectly using tcp_read (which includes lines read by
     tcp_expect) is compared against the pattern.  If the line matches,
     the command given in the key is called with two arguments: the
     name of the session from which the line was read, and the line
     itself.

     If any function called to handle a line returns a non-zero status,
     the line is not output.  Thus a tcp_on_read handler containing only
     the instruction `return 1' can be used to suppress output of
     particular lines (see, however, tcp_filter above).  However, the
     line is still stored in TCP_LINE and tcp_lines; this occurs after
     all tcp_on_read processing.


TCP Utility Parameters
======================

These parameters are controlled by the function system; they may be read
directly, but should not usually be set by user code.

tcp_aliases
     Associative array.  The keys are the names of sessions established
     with tcp_open; each value is a space-separated list of aliases
     which refer to that session.

tcp_by_fd
     Associative array.  The keys are session file descriptors; each
     value is the name of that session.

tcp_by_name
     Associative array.  The keys are the names of sessions; each value
     is the file descriptor associated with that session.



File: zsh.info,  Node: TCP Examples,  Next: TCP Bugs,  Prev: TCP Parameters,  Up: TCP Function System

TCP Examples
============

Here is a trivial example using a remote calculator.

TO create a calculator server on port 7337 (see the dc manual page for
quite how infuriating the underlying command is):

     tcp_proxy 7337 dc

To connect to this from the same host with a session also named `dc':

     tcp_open localhost 7337 dc

To send a command to the remote session and wait a short while for
output (assuming dc is the current session):

     tcp_command 2 4 + p

To close the session:

     tcp_close

The tcp_proxy needs to be killed to be stopped.  Note this will not
usually kill any connections which have already been accepted, and also
that the port is not immediately available for reuse.

The following chunk of code puts a list of sessions into an xterm
header, with the current session followed by a star.

     print -n "\033]2;TCP:" ${(k)tcp_by_name:/$TCP_SESS/$TCP_SESS\*} "\a"


File: zsh.info,  Node: TCP Bugs,  Prev: TCP Examples,  Up: TCP Function System

TCP Bugs
========

The function tcp_read uses the shell's normal read builtin.  As this
reads a complete line at once, data arriving without a terminating
newline can cause the function to block indefinitely.

Though the function suite works well for interactive use and for data
arriving in small amounts, the performance when large amounts of data
are being exchanged is likely to be extremely poor.


File: zsh.info,  Node: Zftp Function System,  Next: User Contributions,  Prev: TCP Function System,  Up: Top

Zftp Function System
********************

Description
===========

This describes the set of shell functions supplied with the source
distribution as an interface to the zftp builtin command, allowing you
to perform FTP operations from the shell command line or within
functions or scripts.  The interface is similar to a traditional FTP
client (e.g. the ftp command itself, see man page ftp(1)), but as it is
entirely done within the shell all the familiar completion, editing and
globbing features, and so on, are present, and macros are particularly
simple to write as they are just ordinary shell functions.

The prerequisite is that the zftp command, as described in *Note The
zsh/zftp Module:: , must be available in the version of zsh installed
at your site.  If the shell is configured to load new commands at run
time, it probably is: typing `zmodload zsh/zftp' will make sure (if
that runs silently, it has worked).  If this is not the case, it is
possible zftp was linked into the shell anyway: to test this, type
`which zftp' and if zftp is available you will get the message `zftp:
shell built-in command'.

Commands given directly with zftp builtin may be interspersed between
the functions in this suite; in a few cases, using zftp directly may
cause some of the status information stored in shell parameters to
become invalid.  Note in particular the description of the variables
$ZFTP_TMOUT, $ZFTP_PREFS and $ZFTP_VERBOSE for zftp.

* Menu:

* Installation::
* Zftp Functions::
* Miscellaneous Features::


File: zsh.info,  Node: Installation,  Next: Zftp Functions,  Up: Zftp Function System

Installation
============

You should make sure all the functions from the Functions/Zftp
directory of the source distribution are available; they all begin with
the two letters `zf'.  They may already have been installed on your
system; otherwise, you will need to find them and copy them.  The
directory should appear as one of the elements of the $fpath array
(this should already be the case if they were installed), and at least
the function zfinit should be autoloaded; it will autoload the rest.
Finally, to initialize the use of the system you need to call the
zfinit function.  The following code in your .zshrc will arrange for
this; assume the functions are stored in the directory ~/myfns:

     fpath=(~/myfns $fpath)
     autoload -U zfinit
     zfinit

Note that zfinit assumes you are using the zmodload method to load the
zftp command.  If it is already built into the shell, change zfinit to
zfinit -n.  It is helpful (though not essential) if the call to zfinit
appears after any code to initialize the new completion system, else
unnecessary compctl commands will be given.

