cut

Print selected parts of lines e.g., from stdin or files.

Examples

Say one have a file with lines having the form x:y:z and one wants all the y's.

cut -d ':' -f 2 filename > output

Where -d specifies the delimiter one wants to cut on and -f specifies which field should be printed.

Reference

Full documentation can be found at https://man7.org/linux/man-pages/man1/cut.1.html or with man cut.