From Simson Garfinkel
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     aigrep - search a file for an idea

     aigrep [ option ] ...  idea [ file ] ...

     The aigrep command will search the input files (standard
     input default) for lines containing the idea.  Normally, each
     line found is copied to the standard output.  Aigrep ideas
     are limited to English; the program uses a compact
     nondeterministic algorithm.  The following options are recognized.

     -v   All ideas but those matching are printed.

     -x   (Exact) Only lines containing exactly the idea and nothing
          else are printed.

     -c   Only a count of matching lines is printed.

     -l   The names of files with matching lines are listed
          (once) separated by newlines.

     -n   Each line is preceded by its relative line number in
          the file.

     -b   Each line is preceded by the block number on which it
          was found.  This is sometimes useful in locating disk
          block numbers by context.

     -i   The case of letters is ignored in making comparisons -
          that is, upper and lower case are considered identical.
          This applies to grep and fgrep only.

     -s   Silent mode.  Nothing is printed (except error mes-
          sages).  This is useful for checking the error status.

     -e idea
          Same as a simple idea argument, but useful when
          the idea begins with a -.

     -f file
          The idea is taken from the file.

     In all cases the file name is shown if there is more than
     one input file.  Care should be taken when specifying ideas
     containing words with pronouns, as they are sometimes susceptable
     to multiple interpertations.  It is safest to use only proper
     nouns in the idea expression.

     doctor(1), lisp(1)

     Exit status is 0 if any matches are found, 1 if none, 2 for
     syntax errors or inaccessible files.