lksh man page

lksh — Legacy Korn shell built on mksh

Synopsis

lksh [-+abCefhiklmnprUuvXx] [-+o opt] [-c string | -sfile [args ...]]

Description

lksh is a command interpreter intended exclusively for running legacy shell scripts. It is built on mksh; refer to its manual page for details on the scripting language. It is recommended to port scripts to mksh instead of relying on legacy or objectionable POSIX-mandated behaviour, since the MirBSD Korn Shell scripting language is much more consistent.

Do not use lksh as an interactive or login shell; use mksh instead.

Note that it's strongly recommended to invoke lksh with -o posix to fully enjoy better compatibility to the POSIX standard (which is probably why you use lksh over mksh in the first place); -o sh (possibly additionally to the above) may be needed for some legacy scripts.

Legacy Mode

lksh currently has the following differences from mksh:

See Also

mksh(1)

http://www.mirbsd.org/mksh.htm

http://www.mirbsd.org/ksh-chan.htm

Caveats

To use lksh as /bin/sh, compilation to enable set -o posix by default if called as sh (adding -DMKSH_BINSHPOSIX to CPPFLAGS) is highly recommended for better standards compliance.

For better compatibility with legacy scripts, such as many Debian maintainer scripts, Upstart and SYSV init scripts, and other unfixed scripts, also adding the -DMKSH_BINSHREDUCED compile-time option to enable both set -o posix -o sh when the shell is run as sh, as well as integrating the optional disrecommended printf(1) builtin, might be necessary.

lksh tries to make a cross between a legacy bourne/posix compatibl-ish shell and a legacy pdksh-alike but “legacy” is not exactly specified.

Talk to the MirOS development team using the mailing list at ⟨miros-mksh@mirbsd.org⟩ or the #!/bin/mksh (or #ksh) IRC channel at irc.freenode.net (Port 6697 SSL, 6667 unencrypted) if you need any further quirks or assistance, and consider migrating your legacy scripts to work with mksh instead of requiring lksh.

Referenced By

mksh(1).

October 14, 2017