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.\" $MirOS: contrib/hosted/tg/deb/mksh/debian/lksh.1,v 1.4 2012/06/30 17:24:36 tg Exp $
.\"-
.\" Copyright (c) 2008, 2009, 2010, 2012
.\"	Thorsten “mirabilos” Glaser <tg@mirbsd.org>
.\"-
.\" Try to make GNU groff and AT&T nroff more compatible
.\" * ` generates ‘ in gnroff, so use \`
.\" * ' generates ’ in gnroff, \' generates ´, so use \*(aq
.\" * - generates ‐ in gnroff, \- generates −, so .tr it to -
.\"   thus use - for hyphens and \- for minus signs and option dashes
.\" * ~ is size-reduced and placed atop in groff, so use \*(TI
.\" * ^ is size-reduced and placed atop in groff, so use \*(ha
.\" * \(en does not work in nroff, so use \*(en
.\" * <>| are problematic, so redefine and use \*(Lt\*(Gt\*(Ba
.\" Also make sure to use \& especially with two-letter words.
.\" The section after the "doc" macropackage has been loaded contains
.\" additional code to convene between the UCB mdoc macropackage (and
.\" its variant as BSD mdoc in groff) and the GNU mdoc macropackage.
.\"
.ie \n(.g \{\
.	if \*[.T]ascii .tr \-\N'45'
.	if \*[.T]latin1 .tr \-\N'45'
.	if \*[.T]utf8 .tr \-\N'45'
.	ds <= \[<=]
.	ds >= \[>=]
.	ds Rq \[rq]
.	ds Lq \[lq]
.	ds sL \(aq
.	ds sR \(aq
.	if \*[.T]utf8 .ds sL `
.	if \*[.T]ps .ds sL `
.	if \*[.T]utf8 .ds sR '
.	if \*[.T]ps .ds sR '
.	ds aq \(aq
.	ds TI \(ti
.	ds ha \(ha
.	ds en \(en
.\}
.el \{\
.	ds aq '
.	ds TI ~
.	ds ha ^
.	ds en \(em
.\}
.\"
.\" Implement .Dd with the Mdocdate RCS keyword
.\"
.rn Dd xD
.de Dd
.ie \\$1$Mdocdate: \{\
.	xD \\$2 \\$3, \\$4
.\}
.el .xD \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8
..
.\"
.\" .Dd must come before definition of .Mx, because when called
.\" with -mandoc, it might implement .Mx itself, but we want to
.\" use our own definition. And .Dd must come *first*, always.
.\"
.Dd $Mdocdate: June 30 2012 $
.\"
.\" Check which macro package we use, and do other -mdoc setup.
.\"
.ie \n(.g \{\
.	if \*[.T]utf8 .tr \[la]\*(Lt
.	if \*[.T]utf8 .tr \[ra]\*(Gt
.	ie d volume-ds-1 .ds tT gnu
.	el .ds tT bsd
.\}
.el .ds tT ucb
.\"
.\" Implement .Mx (MirBSD)
.\"
.ie "\*(tT"gnu" \{\
.	eo
.	de Mx
.	nr curr-font \n[.f]
.	nr curr-size \n[.ps]
.	ds str-Mx \f[\n[curr-font]]\s[\n[curr-size]u]
.	ds str-Mx1 \*[Tn-font-size]\%MirOS\*[str-Mx]
.	if !\n[arg-limit] \
.	if \n[.$] \{\
.	ds macro-name Mx
.	parse-args \$@
.	\}
.	if (\n[arg-limit] > \n[arg-ptr]) \{\
.	nr arg-ptr +1
.	ie (\n[type\n[arg-ptr]] == 2) \
.	as str-Mx1 \~\*[arg\n[arg-ptr]]
.	el \
.	nr arg-ptr -1
.	\}
.	ds arg\n[arg-ptr] "\*[str-Mx1]
.	nr type\n[arg-ptr] 2
.	ds space\n[arg-ptr] "\*[space]
.	nr num-args (\n[arg-limit] - \n[arg-ptr])
.	nr arg-limit \n[arg-ptr]
.	if \n[num-args] \
.	parse-space-vector
.	print-recursive
..
.	ec
.	ds sP \s0
.	ds tN \*[Tn-font-size]
.\}
.el \{\
.	de Mx
.	nr cF \\n(.f
.	nr cZ \\n(.s
.	ds aa \&\f\\n(cF\s\\n(cZ
.	if \\n(aC==0 \{\
.		ie \\n(.$==0 \&MirOS\\*(aa
.		el .aV \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8 \\$9
.	\}
.	if \\n(aC>\\n(aP \{\
.		nr aP \\n(aP+1
.		ie \\n(C\\n(aP==2 \{\
.			as b1 \&MirOS\ #\&\\*(A\\n(aP\\*(aa
.			ie \\n(aC>\\n(aP \{\
.				nr aP \\n(aP+1
.				nR
.			\}
.			el .aZ
.		\}
.		el \{\
.			as b1 \&MirOS\\*(aa
.			nR
.		\}
.	\}
..
.\}
.\"-
.Dt LKSH 1
.Os MirBSD
.Sh NAME
.Nm lksh
.Nd Legacy Korn shell built on mksh
.Sh SYNOPSIS
.Nm
.Bk -words
.Op Fl +abCefhiklmnprUuvXx
.Op Fl +o Ar opt
.Oo
.Fl c Ar string \*(Ba
.Fl s \*(Ba
.Ar file
.Op Ar args ...
.Oc
.Ek
.Sh DESCRIPTION
.Nm
is a command interpreter intended exclusive for running legacy
shell scripts.
It is built on
.Nm mksh ;
refer to its manual page for details on the scripting language.
.Sh LEGACY MODE
.Nm
has the following differences from
.Nm mksh :
.Bl -bullet
.It
.Nm
is not suitable for use as
.Pa /bin/sh .
.It
There is no explicit support for interactive use,
nor any command line editing code.
Hence,
.Nm
is not suitable as a user's login shell, either; use
.Nm mksh
instead.
.It
The
.Ev KSH_VERSION
string identifies
.Nm
as
.Dq LEGACY KSH
instead of
.Dq MIRBSD KSH .
.It
Some
.Nm mksh
specific extensions are missing; specifically, the
.Fl T
command-line option.
.It
.Nm
always uses traditional mode for constructs like:
.Bd -literal -offset indent
$ set -- $(getopt ab:c "$@")
$ echo $?
.Ed
.Pp
POSIX mandates this to show 0, but traditional mode
passes through the errorlevel from the
.Xr getopt 1
command.
.It
.Nm lksh ,
unlike
.At
.Nm ksh ,
does not keep file descriptors \*(Gt 2 private.
.It
.Nm
parses leading-zero numbers as octal (base 8).
.It
Integers use the host C environment's
.Vt long
type, not
.Vt int32_t .
Unsigned arithmetic is done using
.Vt unsigned long ,
not
.Vt uint32_t .
Neither value limits nor wraparound is guaranteed.
Dividing the largest negative number by \-1 is Undefined Behaviour
.Po
but might work on 32-bit and 64-bit
.Vt long
types
.Pc .
.El
.Sh SEE ALSO
.Xr mksh 1
.Pp
.Pa https://www.mirbsd.org/mksh.htm
.Pp
.Pa https://www.mirbsd.org/ksh\-chan.htm
.Sh CAVEATS
.Nm
tries to make a cross between a legacy bourne/posix compatibl-ish
shell and a legacy pdksh-alike but
.Dq legacy
is not exactly specified.
Parsing numbers with leading zero digits or
.Dq 0x
is relatively recent in all
.Nm pdksh
derivates, but supported here for completeness.
It might make sense to make this a run-time option, but
that might also be overkill.
.Pp
The
.Ic set
built-in command does not have all options one would expect
from a full-blown
.Nm mksh
or
.Nm pdksh .
.Pp
Talk to the
.Mx
development team using the mailing list at
.Aq miros\-discuss@mirbsd.org
or the
.Li \&#\&!/bin/mksh
.Pq or Li \&#ksh
IRC channel at
.Pa irc.freenode.net
.Pq Port 6697 SSL, 6667 unencrypted
if you need any further quirks.