grep: select lines matching a pattern
The grep command only copies to output those lines in the input
that match a specified pattern.
The pattern is supplied as a regular expression on the command line
(and should be quoted using single-quotes).
Some options:
-i |
| ignore upper/lower-case difference in matching |
-w |
| only match pattern if it makes a complete word |
-v |
| only display lines that do not match the pattern |
(The name grep is an acronym for Globally search with Regular Expressions and Print)
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