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 3 Option Summary
 ****************
 
 `--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.
 
 `--version, -v, -V'
      Print version information on standard output then exit
      successfully.
 
 `--help'
      Print usage information on standard output then exit successfully.
 
 

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