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//proc/self/root/usr/share/doc/bash-3.2/functions/whence
# # An almost-ksh compatible `whence' command. This is as hairy as it is # because of the desire to exactly mimic ksh. # # This depends somewhat on knowing the format of the output of the bash # `builtin type' command. # # Chet Ramey # chet@ins.CWRU.Edu # whence() { local vflag= path= if [ "$#" = "0" ] ; then echo "whence: argument expected" return 1 fi case "$1" in -v) vflag=1 shift 1 ;; -*) echo "whence: bad option: $1" return 1 ;; *) ;; esac if [ "$#" = "0" ] ; then echo "whence: bad argument count" return 1 fi for cmd do if [ "$vflag" ] ; then echo $(builtin type $cmd | sed 1q) else path=$(builtin type -path $cmd) if [ "$path" ] ; then echo $path else case "$cmd" in /*) if [ -x "$cmd" ]; then echo "$cmd" fi ;; *) case "$(builtin type -type $cmd)" in "") ;; *) echo "$cmd" ;; esac ;; esac fi fi done return 0 }