![]() The variant you have posted as a followup answer will work, as grep returns 0 on a successful match, but 1 if the match fails. Hence, there appears to be something on line 22, but the shell tries to execute the command 22:, which then fails. f file option Takes patterns from file, one per line. Can use multiple times : grep e 'Agarwal' e 'Aggarwal' e 'Agrawal' geekfile.txt 11. Dictionary size is nothing to worry about: a few megabytes at most. The grep command searches either the input or the file you specify for lines that contain characters that match the specified pattern. Memory usage is proportional to the dictionary size, not to the total file size. It doesn't need to keep the whole file in memory, only the area it's searching through. grep 'os' geekfile.txt 10.Specifies expression with -e option. grep memory usage is constant it doesn't scale with file size. In this case, you are outputting the line number with grep's output, following by the matching line. This can be used in grep to match the lines which end with the given string or pattern. $> chk1=$(yum list installed | grep rpmdevtools)īacktick substitution will return the output of the command. This is at least partially true, but it depends on who you ask. With its unusual name, you may have guessed that grep is an acronym. It is used for finding a search patterns in the content of a given file. If you run it with test you have various cases of failure: # note: rpmdevtools is not installed on by computer Grep is a command line utility in Unix and Linux systems.
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