cat: the simplest filter
The cat command copies its input to output unchanged (identity filter).
When supplied a list of file names, it concatenates them onto stdout.
Some options:
-n |
| number output lines (starting from 1) |
-s |
| squeeze consecutive blank lines into single blank line |
-v |
| display control-characters in visible form (e.g. ^C) |
The tac command copies files, but reverses the order of lines.
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