Книга: UNIX — универсальная среда программирования

3.8.66 which2

3.8.66 which2
# which cmd: which cmd in PATH is executed, final version
opath=$PATH PATH=/bin:/usr/bin
case $# in
0) echo 'Usage: which command' 1>&2; exit 2
esac
for i in `echo $opath | sed 's/^:/.:/
                             s/::/:.:/g
                             s/:$/:./
                             s/:/ /g'`
do
 if test -f $i/$1 # this is /bin/test
 then # or /usr/bin/test only
  echo $i/$1
  exit 0 # found it
 fi
done
exit 1 # not found

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