grep¶

To search for a pattern in a file

grep <pattern> <file>

To search recursively in a directory

grep -r <pattern> <directory>

To search case-insensitively

grep -i <pattern> <file>

To show line numbers with matches

grep -n <pattern> <file>

To list only filenames that contain matches

grep -l <pattern> <files>

To count the number of matching lines

grep -c <pattern> <file>

To show lines that do not match

grep -v <pattern> <file>

To match whole words only

grep -w <pattern> <file>

To use extended regular expressions (ere)

grep -E <pattern> <file>

To match a literal string (no regex)

grep -F <pattern> <file>

To show num lines after each match

grep -A <num> <pattern> <file>

To show num lines before each match

grep -B <num> <pattern> <file>

To show num lines of context around each match

grep -C <num> <pattern> <file>

To search only files matching a glob

grep --include='<glob>' -r <pattern> <directory>

To print only the matching part of each line

grep -o <pattern> <file>