On Wed, 20 Jun 2001, Aaron Lawson wrote:
> I think it depends on the version of BASH one is using. 'which' works in
> my version of BASH, but neither 'whereis' nor 'where' works. I'm using GNU
> bash, version 2.05.0(1).
But what does `which which` return and more importantly:
file `which which`
if it is a text file then:
head `which which`
may tell you that it is a csh (or tcsh) script. If you are running tcsh
as your shell then which is builtin to the shell. AIX ships with a
/usr/bin/which script that looks like so:
$ echo $SHELL
/bin/ksh
$ which which
/usr/bin/which
$ head `which which`
#!/usr/bin/csh -f
set prompt = "% "
if ( -f ~/.cshrc) then
source ~/.cshrc
endif
if ( $#argv == 0 ) then
dspmsg which.cat 3 'usage: which command...\n'
exit 1
endif
set noglob
By the way some POSIX compliant shells have a built in command "whence"
while another unix vendor (HP?) used "what" as an equivalent utility.
I doubt these would be useful on OS X but it sometimes pays to know the
difference and how to tell.
Peter Prymmer
