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GNU replacement for the troff and nroff typesetting utilities. More information: <https://www.gnu.org/software/groff>.

Disable network interfaces. More information: <https://manned.org/ifdown>.

Lock the X display until the user supplies their password. More information: <https://manned.org/xtrlock>.

Filter CSV rows with string and pattern matching. Included in csvkit. More information: <https://csvkit.readthedocs.io/en/latest/scripts/csvgrep.html>.

Alter the scheduling priority/niceness of one or more running processes. Niceness values range from -20 (most favorable to the process) to 19 (least favorable to the process). See also: nice. More information: <https://manned.org/renice>.

Split a file into pieces. This generates files named "xx00", "xx01", and so on. More information: <https://www.gnu.org/software/coreutils/csplit>.

Sends a signal to a process, usually related to stopping the process. All signals except for SIGKILL and SIGSTOP can be intercepted by the process to perform a clean exit. More information: <https://manned.org/kill.1posix>.

Cut out fields from stdin or files. More information: <https://www.gnu.org/software/coreutils/cut>.