Appendix A. Useful UNIX Utilities for Shell Programmers
at—at, batch—execute commands at a later time
awk—pattern scanning and processing language
basename—with a directory name delivers portions of the pathname
bc—processes precision arithmetic
cat—concatenates and displays files
chmod—change the permissions mode of a file
clear—clears the terminal screen
compress—compress, uncompress, zcat compress, uncompress files, or display expanded files
cpio—copy file archives in and out
crypt—encodes or decodes a file
cut—removes selected fields or characters from each line of a file
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