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2. Invoking grep
The general synopsis of the grep command line is
grep options pattern input_file_names |
There can be zero or more options. pattern will only be seen as such (and not as an input_file_name) if it wasn’t already specified within options (by using the ‘-e pattern’ or ‘-f file’ options). There can be zero or more input_file_names.
| 2.1 Command-line Options | Short and long names, grouped by category. | |
| 2.2 Environment Variables | POSIX, GNU generic, and GNU grep specific. | |
| 2.3 Exit Status | Exit status returned by grep.
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2.4 grep Programs | grep programs.
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