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Find text within a file or set of files
UNIX® systems provide a useful command for
searching for text within files. The command is named 'grep', for
reasons which are unknown to us.
In its simplest form, the command syntax is:
grep text file
The command returns the whole of any lines in the file which
contain the specified text.
For example:
$ grep John phone-numbers.txt
John Hammonds: 01-639-203-791
John Millerchip: 01-541-201-363
$
You may specify more than one filename, or use wildcards such as
'*.txt'. Grep includes many useful options, such as the ability to
list the line number that the match(es) appear on, or to list only
lines which do not contain
the specified text. Look at the man page for 'grep', and try some
examples – it's a very useful command to get to know well.
Click here for the next
Quick Tip
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