man(1) Manual page archive

     LOOK(1)                                                   LOOK(1)

          look - find lines in a sorted list

          look [ -dfnixtc ] [ string ] [ file ]

          Look consults a sorted file and prints all lines that begin
          with string. It uses binary search.

          The following options are recognized.  Options dfntc affect
          comparisons as in sort(1).

          i    Interactive. There is no string argument; instead look
               takes lines from the standard input as strings to be
               looked up.

          x    Exact.  Print only lines of the file whose key matches
               string exactly.

          d    `Dictionary' order: only letters, digits, tabs and
               blanks participate in comparisons.

          f    Fold.  Upper case letters compare equal to lower case.

          n    Numeric comparison with initial string of digits,
               optional minus sign, and optional decimal point.

          tc   `Tab character' c terminates the sort key in the file.

          If no file is specified, /usr/dict/words is assumed, with
          collating sequence df.


          sort(1), grep(1), dict(7)

          Look returns exit status 0 if string is found, 1 if not
          found, 2 for error.