ifonline

   1 #!/bin/sh
   2
   3 usage() {
   4         cat << EOF
   5 Usage:
   6  $0 [OPTIONS]
   7  $0 -h
   8  $0 -c "echo 'online'"
   9
  10 OPTIONS:
  11   -h            Show this text
  12   -c CMD        Command to execute if online
  13 EOF
  14 }
  15
  16 CMD=""
  17
  18 while getopts "hc:" OPTION; do
  19
  20         case "$OPTION" in
  21                 h)
  22                         usage
  23                         exit
  24                         ;;
  25                 c)
  26                         CMD=$OPTARG
  27                         ;;
  28         esac
  29 done
  30
  31 if [ -z "$CMD" ]; then
  32     echo "No command given."
  33     usage
  34     exit 2
  35 fi
  36
  37 if ping -c1 8.8.8.8 2>&1 >/dev/null; then
  38     $CMD
  39 fi