Can you grep multiple strings?

Can you grep multiple strings?

Grep is a powerful utility available by default on UNIX-based systems. The name stands for Global Regular Expression Print. By using the grep command, you can customize how the tool searches for a pattern or multiple patterns in this case. You can grep multiple strings in different files and directories.

How do we use grep to search for a pattern in multiple files?

To search multiple files with the grep command, insert the filenames you want to search, separated with a space character. The terminal prints the name of every file that contains the matching lines, and the actual lines that include the required string of characters. You can append as many filenames as needed.

How do I grep two lines in a file?

How do I grep for multiple patterns?

1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
4. Another option to grep two strings: grep ‘word1\|word2’ input.

How does grep f work?

Matching a list of expressions. If you have a separate file of text patterns, the -f option lets you specify that file. The grep will consider each line in that file as a pattern to match against the target file.

How do I combine two commands in Linux?

4. Concatenate Commands Conditionally

1. 4.1. Concatenate Commands With “&&“ The “&&” or AND operator executes the second command only if the preceding command succeeds.
2. 4.2. Concatenate Commands With “||” The “||” or OR operator executes the second command only if the precedent command returns an error.

How do you grep 3 lines before and after?

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 the difference between grep egrep and fgrep?

Both egrep and fgrep are derived from the base grep command. The “egrep” stands for “extended grep” while the fgrep stands for “fixed-string grep.” 2.An egrep command is used to search for multiple patterns inside a file or other kind of data repository while frgrep is used to look for strings.