sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline).  The most common usage of sed involves substituting a pattern or string for another string.  But sed can be used for many tasks.  It's a powerful command line utility that should be in everyone's tool bag.

REFERENCED:
► https://www.gnu.org/software/sed/manual/sed.html - Sed Manual

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