Linux Cat Filters

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Linux Cat Filters

When cat command is used inside pipes, it does nothing except moving stdin to stout.

Syntax:

  1. cat <fileName> | cat or tac |  cat or tac |. . .  

Example:

  1. cat weeks.txt | tac | cat | cat | tac  

Linux Cat Filter

Look at the above snapshot, output of one 'cat' or 'tac' command is passing onto another as input.