\\\$1\ \\$2 ..

20 \\\$1\ # \\$2 ..

20 crc *.c # Print checksums of all the C programs

The checksum of each argument is computed and printed, along with the file length and its name, one file per line. This program is useful for seeing if a file transmitted to another machine has arrived correctly. It is conceptually similar to sum, except that it uses a stronger checksum algorithm and also prints the length.