Learning GNU Text Utilities
Why text files, specifically? Well, if you're doing much work at the shell on Linux, you'll start encountering a lot of text or files that can behave like text. Log files, configuration files and output from many commands can all be manipulated with the GNU textutils.
Assuming you're running any of the major Linux distros and have a default installation, you should have the GNU coreutils package installed already. Some minimalist Linux distros ship Busybox instead. If that's the case, you may have some versions of the tools we're discussing here installed, but they may not have all of the same options as the GNU textutils. Both Busybox and the GNU textutils are actually implementations of tools that were initially developed for proprietary UNIX.
Some of the utilities are more useful than others today.
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