Bash modules in Ansible are no different than any other bash scripts, except the way it prints the data on stdout. Bash modules could be as simple as checking if a process is running on the remote host to running some complex commands.
Note
As previously stated, the general recommendation is to use Python for modules. In my opinion the second-best choice (only for very easy modules) is bash module due to its simplicity and user base.
Let's create the file library/kill_java.sh with the following content:
#!/bin/bash
source $1
SERVICE=$service_name
JAVA_PIDS=$(/usr/java/default/bin/jps | grep ${SERVICE} | awk '{print $1}')
if [ ${JAVA_PIDS} ]; then
for JAVA_PID in ${JAVA_PIDS}; do
/usr/bin/kill -9 ${JAVA_PID}
done
echo "failed=False msg="Killed all the orphaned processes for ${SERVICE}""
exit 0
else
echo "failed=False msg="No orphaned processes to kill for ${SERVICE}""
exit...