The GENCAT utility processes a message source file and produces a catalog file usable by the C library messaging functions.

GENCAT creates the message catalog (usually *.cat) from a message source file (usually *.msg) or standard input. You can specify any number of message source files. A message source file is a text file that contains messages consisting of a message number followed by the message text. See the Preprocess Message Source File Utility (MKCATDEF) for using symbolic message identifiers in your message source file.