One of the advantages of Linux/UNIX is that it was not build as a GUI based Operating System. It was a System Administrators OS that was text based (Terminal based) and multi-tasking. Catering for every utility that might be used for system administration would be difficult. A text based scripting language was developed. This is a very powerful and can allow for a multitude of complex operations, right from setting permissions to performing interactive installations.
To extend the capabilities of the scripting language, two additional utilities were developed called AWK and SED. They are quite useful and complex and deserve a book on themselves.
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