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

#!/bin/bash
echo $1 | sed 's/-/:/g' |  awk -F $':' -f <(cat - <<-'EOF'
  {
    if (NF == 1) {
        print $1
    }
    if (NF == 2) {
        print $1*60 + $2
    }
    if (NF == 3) {
        print $1*60*60 + $2*60 + $3;
    }
    if (NF == 4) {
        print $1*24*60*60 + $2*60*60 + $3*60 + $4;
    }
    if (NF > 4 ) {
        print "Cannot convert datatime to seconds"
        exit 2
    }
  }
EOF
) < /dev/stdin

Then to run use:

ps -eo etime | ./script.sh