Parse ps' “etime” output and convert it into seconds

Question

These are possible output formats for ps h -eo etime

21-18:26:30
   15:28:37
      48:14
      00:01

How to parse them into se

Answer 1

Another bash option as a function; uses tac and bc for math.

function etime2sec () {
   # 21-18:26:30
   #    15:28:37
   #       48:14
   #       00:01
etimein=$1
hassec=no ; hasmin=no ; hashr=no ; hasday=no
newline=`echo "${etimein}" | tr ':' '-' | tr '-' ' ' | tac -s " " | tr '\n' ' '`
for thispiece in $(echo "${etimein}" | tr ':' '-' | tr '-' ' ' | tac -s " " | tr '\n' ' ') ; do
  if [[ $hassec = no ]] ; then
    totsec=$thispiece
    hassec=yes
  elif [[ $hasmin = no ]] ; then
    totsec=`echo "$totsec + ($thispiece * 60)" | bc`
    hasmin=yes
  elif [[ $hashr = no ]] ; then
    totsec=`echo "$totsec + ($thispiece * 3600)" | bc`
    hashr=yes
  elif [[ $hasday = no ]] ; then
    totsec=`echo "$totsec + ($thispiece * 86400)" | bc`
    hashr=yes
  fi
done
echo $totsec
}