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From: Luke Kendall <luke AT research DOT canon DOT com DOT au>
Date: Thu, 11 Feb 99 13:31:21 +1100
To: uwin-users AT research DOT att DOT com
Subject: A useful script
Sender: owner-uwin-users AT research DOT att DOT com


> ----------
> From: 	Luke Kendall
> Sent: 	1999年2月11日 11:31:21
> To: 	uwin-users AT research DOT att DOT com
> Subject: 	A useful script
> Auto forwarded by a Rule
> 
An off-list discussion with Christopher Vickers lead me
to think that a small donation of a utility might be of
some value to some people.  "whiches" lists all the
possible commands, in PATH order, for the supplied arguments.

> > > Interesting.  It doesn't work that way under MKS or U/WIN ksh.
> > > bash's "type -a" does, however.
[...]
> But I do wish that whence -a did what your whiches does as
> well as what it does.
> Chris

An extra option to whence, that didn't stop at the first
command found would be useful.

Here is the script.  It can be considerably simplified if
you only want it to work in a truly Unix compatible environment
like U/WIN.

----------------- whiches ---------------------
#!/bin/sh
#
# whiches -- print full pathnames of executable args.
#
# Author: Luke Kendall

. portshell

if [ $# = 0 ]
then
    echo "usage: `basename $0` command-names" >&2
    exit 2
fi

exstat=1

#
# If the path contains semi-colons, it's almost guaranteed to
# be because we're on Windows and using a non-Unix PATH syntax.
#
if expr "$PATH" : ".*;" > $DEVNULL
then
    IFS="; "
else
    IFS=": "
fi

#
# Cygnus bash 19.1 doesn't understand its own UNC PATH name conventions
# when used as an ordinary file path.  Sigh.
#
if [ "x$BASH" = "x" ]
then
    remap=false
else
    remap=true
fi

for i
do
    if expr "x$i" : "x.*/.*" > $DEVNULL
    then
	test -x $i && test ! -d $i && echo $i && exstat=0
    else
	for j in $PATH
	do
	    $remap && j=`echo "$j" | sed 's|^//*¥([A-Za-z]¥)/|¥1:/|'`
	    for suff in "" ".exe" ".sh" ".com" ".bat" ".ksh" ".dll"
	    do
		k="$i$suff"
		test -x "$j/$k" && echo "$j/$k" && exstat=0
	    done
	done
    fi
done
exit $exstat
------------------ portshell ---------------------
#!/bin/sh
#
# Set some variables to make DOS-portable shell scripts possible.
# This script must be sourced by a Bourne-like shell to be effective:
#
#	. portshell
#
# Author: Luke Kendall
#
VARS="DEVTTY DEVNULL EGREP_SILENT TMP SEARCH_SEP"
if test -w /dev/null
then
    DEVTTY=/dev/tty
    DEVNULL=/dev/null
    EGREP_SILENT="s"
    TMP=${TMP:-/tmp}
else
    DEVTTY=con
    DEVNULL=nul
    EGREP_SILENT="q"
    TMP=${TMP:-$TEMP}
    if [ "x$TMP" = "x" ]
    then
	if [ -d c:/tmp ]
	then
	    TMP=c:/tmp
	elif [ -d c:/temp ]
	then
	    TMP=c:/temp
	else
	    echo "Couldn't work out what to set TMP to" >&2
	fi
    fi
fi

#
# If the path contains semi-colons, it's almost guaranteed to
# be because we're on Windows and using a non-Unix PATH syntax.
#
if expr "$PATH" : ".*;" > $DEVNULL
then
    SEARCH_SEP=";"
else
    SEARCH_SEP=":"
fi

export $VARS
unset VARS
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