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001-inpath.sh
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001-inpath.sh
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#!/bin/sh
# inpath - verify that a specified program is either valid as-is,
# or can be found in the PATH directory list.
in_path()
{
# given a command and the PATH, try to find the command. Returns
# 0 if found and executable, 1 if not. Note that this temporarily modifies
# the the IFS (input field seperator), but restores it upon completion.
cmd=$1 path=$2 retval=1
oldIFS=$IFS IFS=":"
for directory in $path
do
if [ -x $directory/$cmd ] ; then
retval=0 # if we're here, we found $cmd in $directory
fi
done
IFS=$oldIFS
return $retval
}
checkForCmdInPath()
{
var=$1
# The variable slicing notation in the following conditional
# needs some explanation: ${var#expr} returns everything after
# the match for 'expr' in the variable value (if any), and
# ${var%expr} returns everything that doesn't match (in this
# case just the very first character. You can also do this in
# Bash with ${var:0:1} and you could use cut too: cut -c1
if [ "$var" != "" ] ; then
if [ "${var%${var#?}}" = "/" ] ; then
if [ ! -x $var ] ; then
return 1
fi
elif ! in_path $var $PATH ; then
return 2
fi
fi
}
if [ $# -ne 1 ] ; then
echo "Usage: $0 command" >&2 ; exit 1
fi
checkForCmdInPath "$1"
case $? in
0 ) echo "$1 found in PATH" ;;
1 ) echo "$1 not found or not executable" ;;
2 ) echo "$1 not found in PATH" ;;
esac
exit 0