Give pact several process IDs. When one process ID dies, pact will kill all provided PIDs.

Example usage:

#!/bin/bash

cmd1 &
PID1=$!
cmd2 --some-arg &
PID2=$!

./pact $PID1 $PID2

##Advanced usage

pact also accepts a one character modifier before the process ID. It can be either M or K. M monitors the process without killing it, and K will not monitor the process, but it will kill the process if another monitored process dies.

Example:

#!/bin/bash

(sleep 5)&
PID1=$!
(sleep 24h)&
PID2=$!

# If the shell dies, kill the other processes. If one of the
# processes die, don't kill the shell.
./pact $PID1 $PID2 M$$

# Pause, because otherwise the shell will immediately die and pact
# will kill the subprocesses.
pause