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grep grep is a saviour command for unix users. grep can be used to search for patterns in a file or standard input. The pattern search includes finding the line number of the keyword, counting the number of occurrences of a keyword and many more. we will see in the following examples. Example 1) grep […] It seems like an esoteric concept, but it’s actually very useful. If your input file is “1 apple steve@example.com”, then your script could say: while read qty product customer do echo “${customer} wants ${qty} ${product}(s)” done The read command will read in the three variables, because they’re spaced out from each other. However, critical data […] Grep with large pattern files When I investigated the run times of grep -f related to large pattern files (with hundreds of lines and more) it became apparent that one can speed up grep by splitting up the pattern files into smaller chunks. I tested this with GNU grep 2.5.3 on a machine with an […] |
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