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Linux 2.6 - man page for which (linux section 1)

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WHICH(1)										 WHICH(1)

       which - locate a command

       which [-a] filename ...

       which returns the pathnames of the files (or links) which would be executed in the current
       environment, had its arguments been given  as  commands	in  a  strictly  POSIX-conformant
       shell.	It does this by searching the PATH for executable files matching the names of the
       arguments. It does not follow symbolic links.

       -a     print all matching pathnames of each argument

       0      if all specified commands are found and executable

       1      if one or more specified commands is nonexistent or not executable

       2      if an invalid option is specified

Debian					    1 May 2009					 WHICH(1)
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