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You can use special characters to cause a pattern to match various strings, in much the same way you use wildcard characters in file names to match a variety of filenames.
Examples of grep usage:
% grep '.outing' demofile % grep 'RFC-97[34]' demofile % grep -i 'rfc-97[34]' demofile (-i mean 'case-insensitive') % grep 'Tw.*on' demofile % grep 'inf.*' demofile % grep '^network' demofile % grep 'routing$' demofile
Common options for the grep command:
You should also note that you can exclude characters with a combination of the caret ^ and square brackets []. For example:
% grep 'J[aei]' names James Jane Jess Jim % grep 'J[^aei]' names Jock John Jordan
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