Basic Format
grep [path] [expression]Key Options
| -i | Ignore case (for example, treat "abc" and "ABC" as equal) |
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| -v | Invert match (only show lines not matching pattern) |
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| -r | Recursive search |
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| -R | (same as -r) |
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| -l | Show only names of files containing the pattern |
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| -n | Show line numbers of lines containing the pattern |
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| -c | Count how many lines match the pattern |
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| -w | Match whole word |
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| -l | Show only the names of files with matching lines, separated by newline |
Examples
| grep 'pattern' filename | Search for a pattern within a file |
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| grep 'string1|string2' filename | Search for lines containing string1 or string2 |
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| grep -r 'pattern' /dir | Recursive search for pattern in /dir |
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| grep -w 'full word' filename | Search for lines containing "full word" |
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| grep -n 'pattern' filename | Show line numbers of lines containing the pattern |
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| grep -c 'pattern' filename | Count the lines containing the pattern |
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| grep --color 'pattern' filename | Highlight the pattern in the output |
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| grep -i 'pattern' filename | Case-insensitive search |
