/* begin *

   which 2.21 (shows the full path to shell commands)

   GNU '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 searching for an executable or script in the
   directories listed in the environment variable PATH using the same
   algorithm as bash(1). 'Which' is a built-in function in many shells.

   The GNU version of which was written by Carlo Wood.

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