rzsh(1)



ZSH(1)                      General Commands Manual                     ZSH(1)

NAME
       zsh - the Z shell

OVERVIEW
       Because  zsh contains many features, the zsh manual has been split into
       a number of sections:

       zsh          Zsh overview (this section)
       zshroadmap   Informal introduction to the manual
       zshmisc      Anything not fitting into the other sections
       zshexpn      Zsh command and parameter expansion
       zshparam     Zsh parameters
       zshoptions   Zsh options
       zshbuiltins  Zsh built-in functions
       zshzle       Zsh command line editing
       zshcompwid   Zsh completion widgets
       zshcompsys   Zsh completion system
       zshcompctl   Zsh completion control
       zshmodules   Zsh loadable modules
       zshcalsys    Zsh built-in calendar functions
       zshtcpsys    Zsh built-in TCP functions
       zshzftpsys   Zsh built-in FTP client
       zshcontrib   Additional zsh functions and utilities
       zshall       Meta-man page containing all of the above

DESCRIPTION
       Zsh is a UNIX command interpreter  (shell)  usable  as  an  interactive
       login  shell  and as a shell script command processor.  Of the standard
       shells, zsh most closely resembles ksh but includes many  enhancements.
       Zsh has command line editing, builtin spelling correction, programmable
       command completion, shell functions (with autoloading), a history mech-
       anism, and a host of other features.

AUTHOR
       Zsh  was  originally  written by Paul Falstad <pf@zsh.org>.  Zsh is now
       maintained by the members of the zsh-workers  mailing  list  <zsh-work-
       ers@zsh.org>.   The  development  is  currently  coordinated  by  Peter
       Stephenson <pws@zsh.org>.  The coordinator can be contacted at <coordi-
       nator@zsh.org>, but matters relating to the code should generally go to
       the mailing list.

AVAILABILITY
       Zsh is available from the following anonymous FTP sites.  These  mirror
       sites are kept frequently up to date.  The sites marked with (H) may be
       mirroring ftp.cs.elte.hu instead of the primary site.

       Primary site
              ftp://ftp.zsh.org/pub/
              http://www.zsh.org/pub/

       Australia
              ftp://ftp.zsh.org/pub/
              http://www.zsh.org/pub/
              http://mirror.dejanseo.com.au/pub/zsh/

       Hungary
              ftp://ftp.cs.elte.hu/pub/zsh/
              http://www.cs.elte.hu/pub/zsh/

       The up-to-date source code is available via Git from Sourceforge.   See
       http://sourceforge.net/projects/zsh/   for   details.    A  summary  of
       instructions  for  the  archive  can  be  found  at  http://zsh.source-
       forge.net/.

MAILING LISTS
       Zsh has 3 mailing lists:

       <zsh-announce@zsh.org>
              Announcements about releases, major changes in the shell and the
              monthly posting of the Zsh FAQ.  (moderated)

       <zsh-users@zsh.org>
              User discussions.

       <zsh-workers@zsh.org>
              Hacking, development, bug reports and patches.

       To subscribe or unsubscribe, send mail to the associated administrative
       address for the mailing list.

       <zsh-announce-subscribe@zsh.org>
       <zsh-users-subscribe@zsh.org>
       <zsh-workers-subscribe@zsh.org>
       <zsh-announce-unsubscribe@zsh.org>
       <zsh-users-unsubscribe@zsh.org>
       <zsh-workers-unsubscribe@zsh.org>

       YOU ONLY NEED TO JOIN ONE OF THE MAILING LISTS AS THEY ARE NESTED.  All
       submissions to zsh-announce are automatically forwarded  to  zsh-users.
       All  submissions  to zsh-users are automatically forwarded to zsh-work-
       ers.

       If you have problems subscribing/unsubscribing to any  of  the  mailing
       lists,  send mail to <listmaster@zsh.org>.  The mailing lists are main-
       tained by Karsten Thygesen <karthy@kom.auc.dk>.

       The mailing lists are archived; the archives can be  accessed  via  the
       administrative  addresses  listed above.  There is also a hypertext ar-
       chive,  maintained  by   Geoff   Wing   <gcw@zsh.org>,   available   at
       http://www.zsh.org/mla/.

THE ZSH FAQ
       Zsh has a list of Frequently Asked Questions (FAQ), maintained by Peter
       Stephenson <pws@zsh.org>.  It is  regularly  posted  to  the  newsgroup
       comp.unix.shell  and the zsh-announce mailing list.  The latest version
       can   be   found   at   any   of   the   Zsh   FTP   sites,    or    at
       http://www.zsh.org/FAQ/.   The  contact address for FAQ-related matters
       is <faqmaster@zsh.org>.

THE ZSH WEB PAGE
       Zsh has a web page which is located at  http://www.zsh.org/.   This  is
       maintained  by  Karsten  Thygesen <karthy@zsh.org>, of SunSITE Denmark.
       The contact address for web-related matters is <webmaster@zsh.org>.

THE ZSH USERGUIDE
       A userguide is currently in preparation.  It is intended to  complement
       the  manual, with explanations and hints on issues where the manual can
       be cabbalistic, hierographic, or downright mystifying (for example, the
       word  `hierographic'  does not exist).  It can be viewed in its current
       state at http://zsh.sourceforge.net/Guide/.  At the  time  of  writing,
       chapters dealing with startup files and their contents and the new com-
       pletion system were essentially complete.

THE ZSH WIKI
       A `wiki' website for zsh has been created  at  http://www.zshwiki.org/.
       This  is  a  site  which can be added to and modified directly by users
       without any special permission.  You can add your own zsh tips and con-
       figurations.

INVOCATION
       The following flags are interpreted by the shell when invoked to deter-
       mine where the shell will read commands from:

       -c     Take the first argument as a command  to  execute,  rather  than
              reading  commands  from a script or standard input.  If any fur-
              ther arguments are given, the  first  one  is  assigned  to  $0,
              rather than being used as a positional parameter.

       -i     Force  shell to be interactive.  It is still possible to specify
              a script to execute.

       -s     Force shell to read commands from the standard input.  If the -s
              flag is not present and an argument is given, the first argument
              is taken to be the pathname of a script to execute.

       If there are any remaining arguments after option processing, and  nei-
       ther  of the options -c or -s was supplied, the first argument is taken
       as the file name of a script containing shell commands to be  executed.
       If  the option PATH_SCRIPT is set, and the file name does not contain a
       directory path (i.e. there is no `/' in the name),  first  the  current
       directory  and  then  the  command  path given by the variable PATH are
       searched for the script.  If the option is not set  or  the  file  name
       contains a `/' it is used directly.

       After  the  first  one  or  two  arguments  have  been  appropriated as
       described above, the remaining arguments are assigned to the positional
       parameters.

       For  further  options,  which  are  common  to  invocation  and the set
       builtin, see zshoptions(1).

       The long option `--emulate' followed (in a separate word) by an  emula-
       tion  mode  may  be passed to the shell.  The emulation modes are those
       described for the emulate builtin, see zshbuiltins(1).  The `--emulate'
       option  must  precede any other options (which might otherwise be over-
       ridden), but following options are honoured, so may be used  to  modify
       the  requested emulation mode.  Note that certain extra steps are taken
       to ensure a smooth emulation when this option is used compared with the
       emulate  command within the shell: for example, variables that conflict
       with POSIX usage such as path are not defined within the shell.

       Options may be specified by name using the -o option.  -o acts  like  a
       single-letter  option, but takes a following string as the option name.
       For example,

              zsh -x -o shwordsplit scr

       runs the script scr, setting the XTRACE  option  by  the  corresponding
       letter  `-x'  and  the  SH_WORD_SPLIT  option  by name.  Options may be
       turned off by name by using +o instead of -o.  -o  can  be  stacked  up
       with  preceding single-letter options, so for example `-xo shwordsplit'
       or `-xoshwordsplit' is equivalent to `-x -o shwordsplit'.

       Options may also be  specified  by  name  in  GNU  long  option  style,
       `--option-name'.   When this is done, `-' characters in the option name
       are permitted: they are translated into `_', and thus ignored.  So, for
       example,  `zsh  --sh-word-split'  invokes  zsh  with  the SH_WORD_SPLIT
       option turned on.  Like other option syntaxes, options  can  be  turned
       off  by replacing the initial `-' with a `+'; thus `+-sh-word-split' is
       equivalent to  `--no-sh-word-split'.   Unlike  other  option  syntaxes,
       GNU-style long options cannot be stacked with any other options, so for
       example `-x-shwordsplit' is an error, rather than  being  treated  like
       `-x --shwordsplit'.

       The  special GNU-style option `--version' is handled; it sends to stan-
       dard output the shell's version information, then  exits  successfully.
       `--help' is also handled; it sends to standard output a list of options
       that can be used when invoking the shell, then exits successfully.

       Option processing may be finished, allowing  following  arguments  that
       start  with  `-' or `+' to be treated as normal arguments, in two ways.
       Firstly, a lone `-' (or `+') as an argument by itself ends option  pro-
       cessing.  Secondly, a special option `--' (or `+-'), which may be spec-
       ified on its own (which is the standard POSIX usage) or may be  stacked
       with  preceding  options  (so `-x-' is equivalent to `-x --').  Options
       are not permitted to be stacked after `--' (so `-x-f' is an error), but
       note  the  GNU-style option form discussed above, where `--shwordsplit'
       is permitted and does not end option processing.

       Except when the sh/ksh emulation single-letter options are  in  effect,
       the  option  `-b' (or `+b') ends option processing.  `-b' is like `--',
       except that further single-letter options can be stacked after the `-b'
       and will take effect as normal.

COMPATIBILITY
       Zsh  tries to emulate sh or ksh when it is invoked as sh or ksh respec-
       tively; more precisely, it looks at the first letter  of  the  name  by
       which  it  was invoked, excluding any initial `r' (assumed to stand for
       `restricted'), and if that is `b', `s' or `k' it  will  emulate  sh  or
       ksh.   Furthermore,  if invoked as su (which happens on certain systems
       when the shell is executed by the su command), the shell  will  try  to
       find  an  alternative name from the SHELL environment variable and per-
       form emulation based on that.

       In sh and ksh compatibility modes the following parameters are not spe-
       cial  and  not  initialized  by the shell: ARGC, argv, cdpath, fignore,
       fpath, HISTCHARS, mailpath, MANPATH,  manpath,  path,  prompt,  PROMPT,
       PROMPT2, PROMPT3, PROMPT4, psvar, status, watch.

       The  usual zsh startup/shutdown scripts are not executed.  Login shells
       source /etc/profile followed by $HOME/.profile.  If the ENV environment
       variable  is  set  on  invocation,  $ENV  is  sourced after the profile
       scripts.  The value of ENV is subjected to parameter expansion, command
       substitution,  and  arithmetic  expansion before being interpreted as a
       pathname.  Note that the PRIVILEGED option also affects  the  execution
       of startup files.

       The  following  options  are  set if the shell is invoked as sh or ksh:
       NO_BAD_PATTERN,   NO_BANG_HIST,   NO_BG_NICE,    NO_EQUALS,    NO_FUNC-
       TION_ARGZERO,  GLOB_SUBST,  NO_GLOBAL_EXPORT,  NO_HUP, INTERACTIVE_COM-
       MENTS, KSH_ARRAYS, NO_MULTIOS, NO_NOMATCH,  NO_NOTIFY,  POSIX_BUILTINS,
       NO_PROMPT_PERCENT,    RM_STAR_SILENT,    SH_FILE_EXPANSION,    SH_GLOB,
       SH_OPTION_LETTERS,  SH_WORD_SPLIT.   Additionally  the   BSD_ECHO   and
       IGNORE_BRACES  options  are  set  if  zsh  is invoked as sh.  Also, the
       KSH_OPTION_PRINT, LOCAL_OPTIONS,  PROMPT_BANG,  PROMPT_SUBST  and  SIN-
       GLE_LINE_ZLE options are set if zsh is invoked as ksh.

RESTRICTED SHELL
       When  the  basename  of  the command used to invoke zsh starts with the
       letter `r' or the `-r' command line option is supplied  at  invocation,
       the  shell  becomes  restricted.   Emulation  mode  is determined after
       stripping the letter `r' from the invocation name.  The  following  are
       disabled in restricted mode:

       o      changing directories with the cd builtin

       o      changing  or  unsetting the EGID, EUID, GID, HISTFILE, HISTSIZE,
              IFS,  LD_AOUT_LIBRARY_PATH,  LD_AOUT_PRELOAD,   LD_LIBRARY_PATH,
              LD_PRELOAD, MODULE_PATH, module_path, PATH, path, SHELL, UID and
              USERNAME parameters

       o      specifying command names containing /

       o      specifying command pathnames using hash

       o      redirecting output to files

       o      using the exec builtin command to replace the shell with another
              command

       o      using jobs -Z to overwrite the shell process' argument and envi-
              ronment space

       o      using the ARGV0 parameter to override argv[0] for external  com-
              mands

       o      turning off restricted mode with set +r or unsetopt RESTRICTED

       These  restrictions  are  enforced  after processing the startup files.
       The startup files should set up PATH to point to a  directory  of  com-
       mands  which can be safely invoked in the restricted environment.  They
       may also add further restrictions by disabling selected builtins.

       Restricted  mode  can  also  be  activated  any  time  by  setting  the
       RESTRICTED  option.   This  immediately  enables  all  the restrictions
       described above even if the shell still has not processed  all  startup
       files.

STARTUP/SHUTDOWN FILES
       Commands  are  first read from /etc/zsh/zshenv; this cannot be overrid-
       den.  Subsequent behaviour  is  modified  by  the  RCS  and  GLOBAL_RCS
       options;  the  former  affects all startup files, while the second only
       affects global startup files (those shown here with  an  path  starting
       with a /).  If one of the options is unset at any point, any subsequent
       startup file(s) of the corresponding type will not be read.  It is also
       possible  for  a file in $ZDOTDIR to re-enable GLOBAL_RCS. Both RCS and
       GLOBAL_RCS are set by default.

       Commands are then read from $ZDOTDIR/.zshenv.  If the shell is a  login
       shell,  commands  are  read  from  /etc/zsh/zprofile  and  then  $ZDOT-
       DIR/.zprofile.  Then, if the shell is interactive,  commands  are  read
       from /etc/zsh/zshrc and then $ZDOTDIR/.zshrc.  Finally, if the shell is
       a login shell, /etc/zsh/zlogin and $ZDOTDIR/.zlogin are read.

       When  a  login  shell  exits,  the  files  $ZDOTDIR/.zlogout  and  then
       /etc/zsh/zlogout  are  read.  This happens with either an explicit exit
       via the exit or  logout  commands,  or  an  implicit  exit  by  reading
       end-of-file from the terminal.  However, if the shell terminates due to
       exec'ing another process, the logout files are  not  read.   These  are
       also  affected  by  the RCS and GLOBAL_RCS options.  Note also that the
       RCS option affects the saving of history files, i.e. if  RCS  is  unset
       when the shell exits, no history file will be saved.

       If ZDOTDIR is unset, HOME is used instead.  Files listed above as being
       in /etc may be in another directory, depending on the installation.

       As /etc/zsh/zshenv is run for all instances of  zsh,  it  is  important
       that it be kept as small as possible.  In particular, it is a good idea
       to put code that does not need to be run for every single shell  behind
       a  test  of the form `if [[ -o rcs ]]; then ...' so that it will not be
       executed when zsh is invoked with the `-f' option.

       Any of these files may be pre-compiled with the zcompile  builtin  com-
       mand  (see  zshbuiltins(1)).   If a compiled file exists (named for the
       original file plus the .zwc extension) and it is newer than the  origi-
       nal file, the compiled file will be used instead.

FILES
       $ZDOTDIR/.zshenv
       $ZDOTDIR/.zprofile
       $ZDOTDIR/.zshrc
       $ZDOTDIR/.zlogin
       $ZDOTDIR/.zlogout
       ${TMPPREFIX}*   (default is /tmp/zsh*)
       /etc/zsh/zshenv
       /etc/zsh/zprofile
       /etc/zsh/zshrc
       /etc/zsh/zlogin
       /etc/zsh/zlogout    (installation-specific - /etc is the default)

SEE ALSO
       sh(1),   csh(1),  tcsh(1),  rc(1),  bash(1),  ksh(1),  zshall(1),  zsh-
       builtins(1), zshcalsys(1), zshcompwid(1), zshcompsys(1), zshcompctl(1),
       zshcontrib(1),  zshexpn(1),  zshmisc(1),  zshmodules(1), zshoptions(1),
       zshparam(1), zshroadmap(1), zshtcpsys(1), zshzftpsys(1), zshzle(1)

       IEEE Standard for information Technology -  Portable  Operating  System
       Interface  (POSIX)  - Part 2: Shell and Utilities, IEEE Inc, 1993, ISBN
       1-55937-255-9.

zsh 5.5.1                       April 16, 2018                          ZSH(1)

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