Get running time of a process given a pid

greptime

#!/bin/bash
pidlist=`ps ax | grep -i -E $1 | grep -v grep | awk '{print $1}' | grep -v PID | xargs echo`
for pid in $pidlist; do
    sincetime $pid
done

sincetime

#!/bin/bash
init=`stat -t /proc/$1 | awk '{print $14}'`
curr=`date +%s`
seconds=`echo $curr - $init| bc`
name=`cat /proc/$1/cmdline`
echo $name $seconds

These are two simple scripts to check the age of running processes. The command:

sincetime <PID> 

should output the age of the process with pid= in seconds.

The command:

greptime <pattern>

where is a string or regular expression, will output all processes matching the pattern and their ages in seconds.