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which



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).

       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 use­
           ful 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.

           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 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)

  




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