# isitup
       
       ```
       #!/bin/sh
       # Author: prx <prx@si3t.ch>
       # licence: MIT
       # Check if $1 is reachable on port $2
       
       help() {
           echo "usage: $0 <domain or IP> <port>"
           exit 1
       }
       
       test $# -eq 2 || help
       nc -zw1 "${1}" "${2}"
           if [ $? -ne 0 ]; then
               printf "Connection to %s port %s failed 😨\n" "$domain" "$port"
               exit 1
           fi
       exit 0
       ```
       
       ---
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