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Definition
grepis a Linux command used to search for lines in a file or input that match a specific word, text, or pattern.
Syntax
Loading...- pattern → The word or text you want to search for.
- filename → The file in which you want to search.
Example
Suppose
students.txt contains:Loading...Search for Bob:
Loading...Output:
Loading...Another Example
Search for Charlie:
Loading...Output:
Loading...Common Options :
Option | Description |
-i | Ignore uppercase/lowercase (case-insensitive search). |
-n | Show line numbers with matching lines. |
-v | Show lines that do not match the pattern. |
-c | Count the number of matching lines. |
-r | Search recursively inside directories. |
-w | Match the whole word only. |
Example: Ignore Case
File:
Loading...Command:
Loading...Output:
Loading...Example: Show Line Numbers
Loading...Output:
Loading...Example: Count Matches
Loading...Output:
Loading...Example: Invert Match
Loading...Output:
Loading...Using grep with a Pipe (|)
Since
grep can read from stdin, it is commonly used with pipes.Example:
Loading...Flow:
Loading...This is equivalent to:
Loading...One-Line Definition for Notes
grepis a Linux command used to search and display lines that match a specified word or pattern from a file or standard input (stdin).