How To Use Grep Command In Linux?
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Grep, which stands for “Global Regular Expression Print,” is a powerful command-line tool that allows you to search for text strings and regular expressions within one or more files.
The basic syntax of the grep command is:
grep [OPTIONS] PATTERN [FILE…]
Where:
PATTERN is the text string or regular expression that you are searching for.
FILE is the file or files to search for the specified pattern.
OPTIONS are any optional parameters that can be used to modify the search.
To search for a string within a file, use the following syntax:
grep PATTERN filename
For example, to search for the string “Hello” in the file example.txt, you would use the following command:
grep “Hello” example.txt
You can also search for multiple strings in multiple files using the following syntax:
grep PATTERN file1 file2 file3
For example, to search for the strings “Hello” and “World” in the files example1.txt, example2.txt, and example3.txt, you would use the following command:
grep “Hello” “World” example1.txt example2.txt example3.txt