Old Process Killer - Finds the passed process name that has been running longer than 24 hours and kills it

oldprocesskiller.sh

#!/bin/bash

# Check for user input
process=$@
if [[ -z "${process}" ]] ;then
   echo "This program requires a process name."
   echo "The (oldest) given process name will be killed"
   echo "if it has been running for > 24 hours"
   exit 1
fi

# get oldest matching pid (-o) with full commandline name match (-f)
processpid=$(pgrep -f -o "${process}")

# Check that we got a pid, exit sucessfully if we don't.
if [[ ${processpid} = *[^0-9]* ]] || [[ -z "${processpid}" ]] ;then
   #echo "(${processpid}) is empty or a non-digit value"
   exit 0
fi

# From man ps
#       start_time  START     starting time or date of the process.  Only the year will be displayed if
#                             the process was not started the same year ps was invoked, or "MmmDD" if it
#                             was not started the same day, or "HH:MM" otherwise.  See also
#                             bsdstart, start, lstart, and stime.
processstart=$(ps --no-headers -o start_time ${processpid})

# so we should only have ##:##:## in this variable (if it is under 24 hours old)
if [[ ${processstart} = *[^0-9\:]* ]] ;then
   #echo "(${processstart}) is not in HH:MM:SS format, must be older then 24 hours"
   #read -p "press enter to kill pid"
   /bin/kill -9 ${processpid}
   #echo "killed ${processpid}"
fi