A quick tutorial on GREP command | Engineer
Grep stands for Global Regular Expression Print. It is as useful command for linux or unix environment which allows user for pattern matching against a single file, multiple file or stream of output.
Below are some detailed "Options"
-c : This prints only a count of the lines that match a pattern
-i : Ignores case for matching
-l : Displays list of a filenames only.
-n : Display the matched lines and their line numbers.
-v : This prints out all the lines that do not matches the pattern
-w : Match whole word
-o : Print only the matched parts of a matching line, with each such part on a separate output line.
Below are some basic grep commands:
grep linux f1.txt
grep linux f1.txt
grep -i linux f1.txt
grep -i -w linux f1.txt
grep -i -c linux f1.txt
grep -l linux f1.txt
grep -l linux f1.txt dummy.txt
grep -i linux f1.txt
grep -i -o linux f1.txt
grep -i -n linux f1.txt
grep -i -v linux f1.txt
grep "^Linux" f1.txt
grep "ful$" f1.txt
grep "ful.$" f1.txt
grep "ful.$" f1.txt
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