#!/usr/bin/env osh
:
: osh - " Force sh(1), csh(1), and other shells to exit w/ error! " <'' ;;;
:
: "  @(#)$Id: d998458fa0a1699a3ebc75310499b32247dca504 $  "
:
: "  The author of this file, J.A. Neitzel <jan (at) v6shell (dot) org>,  "
: "  hereby grants it to the public domain.                               "
:

:
: "  Print the filename portion of a pathname.  "
:
: "  usage: basename string [suffix]  "
:

: " Check for correct usage. "
: >>$0'' <'' ; : >>$1'' <'' ; : >>$2'' <''
killer $0 basename
if $n != 1 -a $n != 2 if { exit } pusage $0 '"string [suffix]"'

if X$1 = X if { exit } echo

echo $1 | tr -d / | grep '^$' >/dev/null
if $s = 0 if { exit } echo /

if X$2 = X goto No_Suffix

	echo $1 | sed 's,/*$,, ; s,^.*/,, ; s,.*,if X& = X'$2, | osh -
	if $s = 0 goto No_Suffix

	echo $1 | sed 's,/*$,,' | grep -- $2\$ >/dev/null
	if $s != 0 goto No_Suffix

	echo $1 | sed 's,/*$,,' | grep / >/dev/null
	if $s = 0 goto Directory_Prefix

		echo $1 | sed 's,/*$,, ; s,^\(.*\)'$2'$,\1,' ; exit

	: Directory_Prefix
		echo $1 | sed 's,/*$,, ; s,^.*/\(.*\)'$2'$,\1,' ; exit

: No_Suffix
	echo $1 | sed 's,/*$,, ; s,^.*/,,'