Difference between revisions of "Ksh"

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[[Category:Command shells (English)]]
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[[Category:Command shells]]
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Korn Shell (ksh) is a standard/restricted command and programming language developed by AT&T.
  
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== Installation ==
  
Korn Shell (ksh) is a standard/restricted command and programming language developed by AT&T.
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The version from AT&T can be found on [https://aur.archlinux.org/packages.php?ID=13772 AUR].
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The [http://www.mirbsd.org/mksh.htm MirBSD™ Korn Shell] is another free implementation of the Korn Shell. You can [[pacman|install]] through the {{Pkg|mksh}} package.
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The Public Domain Korn Shell is available as {{AUR|pdksh}}.
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== Making ksh your default login shell ==
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[[systemd]] does not implicitly make use of a shell (previously, Arch Linux init scripts were using [[Bash]]). After the boot process is complete, the default login shell is user-specified. The '''chsh''' command can be used to change a user's default login shell without root access if the shell is listed in {{ic|/etc/shells}}. (If Ksh was installed using pacman, it should already have an entry in {{ic|/etc/shells}}). 
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Grab the full path for Ksh using {{ic|/usr/bin/which}}:
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$ which ksh
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Which will probably output:
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/bin/ksh
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Change the default shell for the current user:
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$ chsh -s /bin/ksh
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'''Alternative as root, using usermod'''
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Change the default shell using usermod:
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# usermod -s /bin/ksh username
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{{Note| The user needs to logout and log back in, to start using Ksh as their default shell.}}
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After logging back in, verify that Ksh is the default shell with:
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$ echo $SHELL
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== Uninstallation ==
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You must first change your default shell back to Bash before removing the Ksh package.
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Change the default shell for the current user to Bash:
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$ chsh -s /bin/bash
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'''Alternative as root, using usermod'''
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 +
Change the default shell using usermod:
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 +
# usermod -s /bin/bash username
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Now you can safely remove the Ksh package.
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{{Warning|Failure to follow the above will result in all kinds of problems.}}
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If you did not follow the above, you can still change the default shell back to Bash by editing {{ic|/etc/passwd}} as root.  
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For example from:
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username:x:1000:1000:Full Name,,,:/home/username:/bin/ksh
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to:
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username:x:1000:1000:Full Name,,,:/home/username:/bin/bash
  
The version from AT&T can be found on AUR (http://aur.archlinux.org/packages.php?ID=13772),
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== See also ==
but there is also a public domain implementation named "pdksh", which is in extra (http://www.archlinux.org/packages/extra/i686/pdksh/)
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Some features are described here: http://bootiack.livejournal.com/294776.html
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* [http://www.cs.mun.ca/~michael/pdksh/ pdksh official page]
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* [http://en.wikipedia.org/wiki/Korn_shell Korn Shell at Wikipedia]
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* [http://linux.die.net/man/1/pdksh pdksh man page at die.net]
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* [http://kornshell.com/ Home page for the KornShell command and programming language]
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* [http://www.openbsd.org/cgi-bin/man.cgi?query=ksh&sektion=1 pdksh man page at OpenBSD]

Revision as of 12:24, 1 June 2013

Korn Shell (ksh) is a standard/restricted command and programming language developed by AT&T.

Installation

The version from AT&T can be found on AUR.

The MirBSD™ Korn Shell is another free implementation of the Korn Shell. You can install through the mksh package.

The Public Domain Korn Shell is available as pdkshAUR.

Making ksh your default login shell

systemd does not implicitly make use of a shell (previously, Arch Linux init scripts were using Bash). After the boot process is complete, the default login shell is user-specified. The chsh command can be used to change a user's default login shell without root access if the shell is listed in /etc/shells. (If Ksh was installed using pacman, it should already have an entry in /etc/shells).

Grab the full path for Ksh using /usr/bin/which:

$ which ksh

Which will probably output:

/bin/ksh

Change the default shell for the current user:

$ chsh -s /bin/ksh

Alternative as root, using usermod

Change the default shell using usermod:

# usermod -s /bin/ksh username
Note: The user needs to logout and log back in, to start using Ksh as their default shell.

After logging back in, verify that Ksh is the default shell with:

$ echo $SHELL

Uninstallation

You must first change your default shell back to Bash before removing the Ksh package.

Change the default shell for the current user to Bash:

$ chsh -s /bin/bash

Alternative as root, using usermod

Change the default shell using usermod:

# usermod -s /bin/bash username

Now you can safely remove the Ksh package.

Warning: Failure to follow the above will result in all kinds of problems.

If you did not follow the above, you can still change the default shell back to Bash by editing /etc/passwd as root.

For example from:

username:x:1000:1000:Full Name,,,:/home/username:/bin/ksh

to:

username:x:1000:1000:Full Name,,,:/home/username:/bin/bash

See also