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>#! /bin/bash >umask 022 >export PATH=".:~/bin:/bin:/usr/bin" >export HOME=`(cd ~; pwd)` >alias which="$HOME/c/which/which" >touch cat; chmod 755 cat; pwd /home/carlo/c/which >alias >which Usage: which [options] [--] COMMAND [...] Write the full path of COMMAND(s) to standard output. --version, -[vV] Print version and exit successfully. --help, Print this help and exit successfully. --skip-dot Skip directories in PATH that start with a dot. --skip-tilde Skip directories in PATH that start with a tilde. --show-dot Don't expand a dot to current directory in output. --show-tilde Output a tilde for HOME directory for non-root. --tty-only Stop processing options on the right if not on tty. --all, -a Print all matches in PATH, not just the first --read-alias, -i Read list of aliases from stdin. --skip-alias Ignore option --read-alias; don't read stdin. --read-functions Read shell functions from stdin. --skip-functions Ignore option --read-functions; don't read stdin. Recommended use is to write the output of (alias; declare -f) to standard input, so that which can show aliases and shell functions. See which(1) for examples. If the options --read-alias and/or --read-functions are specified then the output can be a full alias or function definition, optionally followed by the full path of each command used inside of those. Report bugs to <which-bugs@gnu.org>. >which --version GNU which v2.21, Copyright (C) 1999 - 2015 Carlo Wood. GNU which comes with ABSOLUTELY NO WARRANTY; This program is free software; your freedom to use, change and distribute this program is protected by the GPL. >which -- --version which: no --version in (.:~/bin:/bin:/usr/bin) >which cat /home/carlo/c/which/cat >which --show-tilde cat ~/c/which/cat >which --show-dot cat ./cat >which --show-tilde --show-dot cat ./cat >which --skip-dot cat /bin/cat >(cd /bin; which cat) /bin/cat >(cd /bin; which --show-dot cat) ./cat >(cd /bin; PATH=".:/bin:/usr/bin" which --show-dot cat) ./cat >(cd /bin; PATH="/bin:.:/usr/bin" which --show-dot cat) /bin/cat >(cd /bin; PATH=".:/bin:/usr/bin" which --skip-dot --show-dot cat) /bin/cat >which ls /bin/ls >which xxx which: no xxx in (.:~/bin:/bin:/usr/bin) >which ./ls which: no ls in (.) >(cd /; which bin/ls) /bin/ls >(cd /; which --show-dot bin/ls) ./bin/ls >(cd /; which --show-dot /bin/ls) /bin/ls >(cd /; which --show-dot bin/xxx) which: no xxx in (./bin) >(cd /; which --show-dot /bin/xxx) which: no xxx in (/bin) >which --all cat /home/carlo/c/which/cat /bin/cat >touch xxx >which ./xxx which: no xxx in (.) >chmod 711 xxx >which ./xxx /home/carlo/c/which/xxx >chmod 655 cat >which cat /bin/cat >su >chown root cat >exit >which cat /home/carlo/c/which/cat >su >chmod 545 cat >exit >which cat /bin/cat >su >chgrp bin cat >exit >which cat /home/carlo/c/which/cat >su >chmod 541 cat >exit >which cat /home/carlo/c/which/cat >su >rm -f cat >chown root xxx >exit >which ./xxx /home/carlo/c/which/xxx >su >chmod 700 xxx >exit >which ./xxx which: no xxx in (.) >id uid=1000(carlo) gid=1000(carlo) groups=1000(carlo),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),50(staff),104(scanner),107(bluetooth),109(netdev),122(lpadmin) >ls -l xxx -rwx------ 1 root carlo 0 Mar 20 17:30 xxx >su >chmod 750 xxx >chgrp carlo xxx >exit >which ./xxx /home/carlo/c/which/xxx >su >chgrp bin xxx >exit >which ./xxx which: no xxx in (.) >alias which='alias | which --tty-only --read-alias --show-tilde --show-dot' >alias test1='test1' >alias test2='echo "test2" | cat | sort' >alias test3=' echo "test2"|cat&sort' >alias test4=' ls &&sort ||/usr/bin/which || exit' >which which alias which='alias | which --tty-only --read-alias --show-tilde --show-dot' ~/c/which/which >which test1 alias test1='test1' >which test2 alias test2='echo test2 | cat | sort' /bin/echo /bin/cat /usr/bin/sort >which test3 alias test3=' echo test2|cat&sort' /bin/echo /bin/cat /usr/bin/sort >which test4 alias test4=' ls &&sort ||/usr/bin/which || exit' /bin/ls /usr/bin/sort /usr/bin/which