grep: Command-line Options

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1 2.1 Command-line Options
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1 ‘grep’ comes with a rich set of options: some from POSIX and some being
1 GNU extensions.  Long option names are always a GNU extension, even for
1 options that are from POSIX specifications.  Options that are specified
1 by POSIX, under their short names, are explicitly marked as such to
1 facilitate POSIX-portable programming.  A few option names are provided
1 for compatibility with older or more exotic implementations.
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Menu

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· Generic Program Information
· Matching Control
· General Output Control
· Output Line Prefix Control
· Context Line Control
· File and Directory Selection
· Other Options
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1    Several additional options control which variant of the ‘grep’
1 matching engine is used.  ⇒grep Programs.
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