This program reads nucleic acid sequences and writes their Watson-Crick
complements
to standard output. The sequences are usually read from an input file.
If no filename is
given, complement works in interactive mode. In this mode the user
is prompted to type
in a sequence, and the complement is put out immediately. You can leave
the interactive
mode (and exit the program) by entering @.
See the manual for a more detailed
description of this tool.