grep is a command-line utility in Unix and Unix-like operating systems used for searching plain-text data for lines that match a specified pattern. The name stands for "Global Regular Expression Print."
Key Features:
- Pattern Matching: It uses regular expressions to define search patterns, allowing for complex searches.
- Output: By default,
grepprints the lines from the input that match the pattern. - Options: It has various options to modify its behavior, such as:
-i: Ignore case (case-insensitive search).-v: Invert match (show lines that do not match the pattern).-r: Recursively search through directories.
Example:
To search for the word "error" in a file named log.txt, you would use:
grep 'error' log.txtThis command will display all lines in log.txt that contain the word "error".
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