How do I grep with multiple values?
How do I grep for multiple patterns?
- Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
- Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
- Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
- Another option to grep two strings: grep ‘word1\|word2’ input.
How do you grep multiple lines after a match?
For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match. If you want the same number of lines before and after you can use -C num . This will show 3 lines before and 3 lines after.
What is ADD or condition in grep command?
1. Grep OR Using \| If you use the grep command without any option, you need to use \| to separate multiple patterns for the or condition. For example, grep either Tech or Sales from the employee.
Is grep case sensitive?
By default, grep is case sensitive. This means that the uppercase and lowercase characters are treated as distinct. To ignore case when searching, invoke grep with the -i option (or –ignore-case ).
How do you grep the next 4 lines?
To also show you the lines before your matches, you can add -B to your grep. The -B 4 tells grep to also show the 4 lines before the match. Alternatively, to show the log lines that match after the keyword, use the -A parameter. In this example, it will tell grep to also show the 2 lines after the match.
How do I print 5 lines after grep?
You can use grep with -A n option to print N lines after matching lines. Using -B n option you can print N lines before matching lines. Using -C n option you can print N lines before and after matching lines.
What does grep V do?
2 Answers. grep -v “grep” takes input line by line, and outputs only the lines in which grep does not appear. Without -v , it would output only the lines in which grep does appear.
What is grep or pattern searching?
Grep is a command line utility in Unix and Linux systems. It is used for finding a search patterns in the content of a given file. With its unusual name, you may have guessed that grep is an acronym.
What does grep -V grep do?
-v means “invert the match” in grep, in other words, return all non matching lines. | is the pipe character, it takes the output of the command on the left hand side, and uses it as the input of the command on the right hand side. bc is like a command line calculator (to do basic math).
What does grep mean?
Grep stands for Global regular expression print. As the name implies, Grep is used to search text files with regular expressions(shortly regex). It prints the lines matching the given pattern in a text file.