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"grep"

This command used to search for information in a file or files. For example, suppose that we have a file named "test" whose contents are
test1 test2
test3 test4
test5 test6
test7 test8
test9 test10

Then we can look up items in our file like this;
% grep test1 test
test1 test2
% grep test3 test
test3 test4
% grep test8 test
test7 test8

For more detail "grep" command you can use:
% man grep

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