Install
=======

You will need an ANSI C compiler (like gcc or egcs) 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(1)                                                 WHICH(1)


NAME
       which - show full path of commands

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

DESCRIPTION
       Which takes one or more arguments.  For each of its argu-
       ments 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 searching
       for an executable or script in the directories listed in
       the environment variable PATH using the same algorithm as
       bash(1).

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 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 match-
           ing 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.

       --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
       A useful way to use this utility is by adding an alias for
       which like the following:

              alias which='which --tty-only --show-tilde --show-dot'

       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

       Aliases are also supported, through the use  of  an  alias
       for  which  itself.   An  example  alias for which that is
       using this feature is as follows:

              alias which='alias | which --tty-only --read-alias --show-tilde --show-dot'

       This will print the output of alias for  each  alias  that
       matches  one  of  the given arguments.  For example, using
       this alias on itself in a tcsh:

              $ alias which alias \| /usr/bin/which -i !\*
              $ which which
              which   (alias | ./which -i !*)
                      /usr/bin/which


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

AUTHOR
       Carlo Wood <carlo@gnu.org>

SEE ALSO
       bash(1)
