assgn3/process-pid.sh

   1 #!/usr/bin/env bash
   2
   3 USAGE="usage: ./process-pid.sh {[-h, -a], [-f, -e] <pid>}, -s <regexp>"
   4
   5 # -h case
   6 if [[ "$1" -eq "-h" ]]; then
   7         echo "$USAGE"; exit 0
   8
   9 # <pid> case
  10 elif [[ "$1" =~ ^-?[0-9]+$ ]]; then
  11         if `ps $1 > /dev/null 2>&1`; then
  12                 echo "you win!"; exit 0
  13
  14         else
  15                 echo -ne "invalid pid\n$USAGE"; exit 1
  16         fi
  17
  18 # -e <pid> case
  19 elif [[ "$1" -eq "-e" && "$2" =~ ^-?[0-9]+$ ]]; then
  20         if `ps $2 > /dev/null 2>&1`; then
  21                 echo "you win!"; exit 0;
  22
  23         else
  24                 echo -ne "invalid pid\n$USAGE"; exit 1
  25
  26 # -s <pid> <regex> case
  27 elif [[ "$1" -eq "-s" && "$2" =~ ^-?[0-9]+$ ]]; then
  28         if `ps $2 > /dev/null 2>&1`; then
  29                 echo "you win!"; exit 0;
  30
  31         else
  32                 echo -ne "invalid pid\n$USAGE"; exit 1
  33
  34 else
  35         echo "$USAGE"; exit 1
  36 fi