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Install
=======

You will need an ANSI C compiler (like gcc) to compile this package.

Just type `make', followed by `make install'.

History
=======

The main difference with version 1.0 by Paul Vixie is that this
version will not return directory names as being executables
and that by default it will expand a leading "./" and "~/" to
its full path on output.

The -all option has been added in example of a version of which
on Ultrix.  They use `-a' as option.

The --read-alias idea has been copied from a version of which by
Maarten Litmaath called `which-v6', he was using `-i' as option
which stands for `interactive'.

Manual page
===========

     which - shows the full path of (shell) commands.

SYNOPSIS
     which [options] [--] programname [...]

DESCRIPTION
     Which  takes  one or more arguments. For each of its arguments it prints to
     stdout the full path of the executables that would have been executed  when
     this argument had been entered at the shell prompt. It does this by search-
     ing  for  an executable or script in the directories listed in the environ-
     ment variable PATH using the same algorithm as bash(1).

     This man page is generated from the file which.texinfo.

OPTIONS
     --all, -a
         Print all matching executables in PATH, not just the first.

     --read-alias, -i
         Read aliases from stdin, reporting matching ones  on  stdout.  This  is
         useful in combination with using an alias for which itself. For example
         alias which='alias | which -i'.

     --skip-alias
         Ignore  option  `--read-alias',  if  any.  This  is useful to explicity
         search for normal binaries, while using the `--read-alias' option in an
         alias or function for which.

     --read-functions
         Read shell function definitions from stdin, reporting matching ones  on
         stdout.  This  is useful in combination with using a shell function for
         which itself.  For example:
         which() { declare -f | which --read-functions "$@" }
         export -f which

     --skip-functions
         Ignore option `--read-functions', if any. This is useful  to  explicity
         search  for  normal binaries, while using the `--read-functions' option
         in an alias or function for which.

     --skip-dot
         Skip directories in PATH that start with a dot.

     --skip-tilde
         Skip directories in PATH that start with a tilde and executables  which
         reside in the HOME directory.

     --show-dot
         If  a directory in PATH starts with a dot and a matching executable was
         found for that path, then print "./programname" rather  than  the  full
         path.

     --show-tilde
         Output a tilde when a directory matches the HOME directory. This option
         is ignored when which is invoked as root.

     --tty-only
         Stop processing options on the right if not on tty.
     --tty-only
         Stop processing options on the right if not on tty.

     --version,-v,-V
         Print version information on standard output then exit successfully.

     --help
         Print usage information on standard output then exit successfully.

RETURN VALUE
     Which  returns  the number of failed arguments, or -1 when no `programname'
     was given.

EXAMPLE
     The recommended way to use this utility is by adding an alias (C shell)  or
     shell function (Bourne shell) for which like the following:

     [ba]sh:

          which ()
          {
            (alias; declare -f) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "$@"
          }
          export -f which

     [t]csh:

          alias which 'alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'

     This  will  print  the  readable  ~/  and  ./ when starting which from your
     prompt, while still printing the full path when used from a script:

          > which q2
          ~/bin/q2
          > echo $(which q2)
          /home/carlo/bin/q2


BUGS
     The HOME directory is determined by looking for the HOME environment  vari-
     able,  which  aborts when this variable doesn't exist.  Which will consider
     two equivalent directories to be different when one of them contains a path
     with a symbolic link.

AUTHOR
     Carlo Wood <carlo@gnu.org>

SEE ALSO
     bash(1)

                                                                        WHICH(1)