![]() grep strings with alphabetic characters only The following grep command gets all valid IPv4 addresses from a specified file. To use grep command with AND condition, use the following syntax. You can also use -e option to search for multiple patterns with OR condition. The following example prints the lines that contain either hours or movie in a test2.txt file. It prints the lines that contain either of the matching patterns. You have to separate patterns with a | symbol. You can use -E option to grep multiple patterns with OR condition. To search for lines that start with S, you can use ^S regex. $ grep -E "(^| )hours( |$)" test2.txtĪ caret ( ^) indicates the beginning of the line. Grepping patterns with spaces is helpful when you only want to match patterns that contain spaces.įor example, this command searches for an exact match hours with leading or trailing white space characters. The second command moves tmpfile to test.txt, replacing the old one.Īs you can see, all matching lines are removed. Here, the -v option is used to get non-matching lines and the output is redirected to a file tmpfile. $ grep -v strange test.txt > tmpfile & mv tmpfile test.txt The following command removes matching lines from a test.txt with the help of grep and mv command. You can also use the grep command to delete a matching line from a file. grep pattern and delete a line from a file # cat -n test.txt | grep Iron -A 10 | awk "NR=1 \ ġ5. Next let us grep for string " Iron" and print 1st, 8th and 10th line after the match. ![]() We will add line numbers to our sample file: # cat -n test.txtġ Iron pyrite is the most foolish of all minerals.Ģ The pet shop stocks everything you need to keep your anaconda happy.ģ The father handed each child a roadmap at the beginning of the road trip.Ĥ The memory we used to share is no longer coherent.Ħěehind the window was a reflection that only instilled fear.ħ Siri became confused when we reused to follow her directions.Ĩ He had a vague sense that trees gave birth to dinosaurs.ĩ They wandered into a strange Tiki bar on the edge of the small beach town.ġ0 She looked into the mirror and saw another person. grep and print specific lines after match Similarly, you can use the -B option to print N lines before matching lines. grep string with special characters (brackets, dot, colon, quotes, wildcard, etc) grep strings with alphanumeric characters only grep recursively only till a certain depth in the directory grep recursively in all directories and sub-directories grep the previous character after the match grep pattern and print word before the pattern
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