check process uptime

Simple script to get any linux process uptime.
It could have been done using the /proc/PID too.

Here is the code:

#!/bin/bash
# Script to get a process uptime, alerts if process time is under CRIT value
# can be used to monitor if any process has been restarted, output graphic of uptime in minutes
# by Felipe Ferreira http://felipeferreira.net
# Dez. 2014
if [ "$2" == "" ]
then
  echo -e "\n Syntax: $0 processos Critical \nex.: $0  tomcat.classificados 90 \n Check process uptime and alerts if was restared\n"
  exit 3
fi
PROC=$1
CRIT=$2
#GET PID
CMD="ps -ef |grep $PROC |grep -v grep |awk '{ print \$2 }' |head -n1"
P=`eval $CMD`
#GET UPTIME
TIME=`ps -p $P -o etime=`
if [ -z $TIME ];then
	echo "UNKOWN - $PROC PID $P uptime $TIME not found"
	exit 3
fi
# FORMAT 28-03:27:2
# GET MINUTES
M=`echo $TIME|awk -F":" '{ print $2 }'`
# GET DAYS (ONLY IF THERE)
if [[ $TIME == *"-"* ]]
then
	D=`echo $TIME|awk -F"-" '{ print $1 }'`
	H=`echo $TIME|awk -F":" '{ print $1 }'|awk -F"-" '{ print $NF }'`
	# CONVERT DAYS TO MIN
	D=`expr $D \* 1440`
else
	H=`echo $TIME|awk -F":" '{ print $1 }'`
fi
# CONVERT HOURS TO MIN
H=`expr $H \* 60`
#echo "D: $D H: $H M: $M"
CTIME=`expr $M + $H`
if [ ! -z "$D" ]; then
	CTIME=`expr $CTIME + $D`
fi
# CLEANUP
TIME=`echo ${TIME} | sed -e 's/^[ \t]*//'`
MSG="Process $P $PROC uptime is $TIME (dias-hrs) $CTIME min|uptime=$CTIME"
if [ "$CTIME" -lt "$CRIT" ];then
  echo "CRITICAL - $MSG"
  exit 2
else
   echo "OK - $MSG"
 exit 0
fi