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Diffstat (limited to 'examples/functions/which')
-rw-r--r-- | examples/functions/which | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/examples/functions/which b/examples/functions/which new file mode 100644 index 0000000..ca33703 --- /dev/null +++ b/examples/functions/which @@ -0,0 +1,44 @@ +# +# which - emulation of `which' as it appears in FreeBSD +# +# usage: which [-as] command [command...] +# + +which() +{ + local aflag sflag ES a opt + + OPTIND=1 + while builtin getopts as opt ; do + case "$opt" in + a) aflag=-a ;; + s) sflag=1 ;; + ?) echo "which: usage: which [-as] command [command ...]" >&2 + exit 2 ;; + esac + done + + (( $OPTIND > 1 )) && shift $(( $OPTIND - 1 )) + + # without command arguments, exit with status 1 + ES=1 + + # exit status is 0 if all commands are found, 1 if any are not found + for command; do + # if $command is a function, make sure we add -a so type + # will look in $PATH after finding the function + a=$aflag + case "$(builtin type -t $command)" in + "function") a=-a;; + esac + + if [ -n "$sflag" ]; then + builtin type -p $a $command >/dev/null 2>&1 + else + builtin type -p $a $command + fi + ES=$? + done + + return $ES +} |