CommandLine tools

Bourne Again Shell
This is a quick reference guide for the language and features of the Bourne Again Shell ("Bash")
GNU Core Utilities
This is a reference guide for the common commandline utilities of a Linux system.
grep searches the input files for lines containing a match to a given pattern list. When it finds a match in a line, it copies the line to standard output (by default), or produces whatever other sort of output you have requested with options.

Development Tools

System Utility Programming
This is a guide to writing system management and reporting tools in various languages.
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