I have a shell script to manage and report on my Tomcat instances. I wanted the ‘status’ portion of the script to report on instance uptime (which, by the way, has improved significantly since switching to JRockit). The script was already reporting the PID of the parent tomcat process so I shoved in this one-liner that takes that PID and gets the elapsed time from ps. I filter the result through grep and sed to get a clean human-readable output.
The output is formated as one of days&hours, hours&minutes, minutes&seconds.
Anyone got a better or different way?