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- Compares two text files for differences and offers several forms
- of output via command line options and versatile redirected
- output. The ZCPR3 program error flag is set on error or if the
- two files do not match. DIF should run fine under vanilla CP/M,
- but piping is available only under ZCPR3. Version 1.3 corrects
- bug in LST: and NUL: output redirection.