freeportfinder.sh

#! /bin/bash

DIR=$1

find_free_port() {
    res=""
    for port in {10001..15000} ; do
        (echo '' >/dev/tcp/localhost/$port) >/dev/null 2>&1 || { res=$port; break; } ;
    done
    echo "$res"
}

myport=$(find_free_port)

echo ${myport}

# if [ -z "$myport" ] ; then
#     (>&2 echo 'ERROR: no free port' )
#     exit 1
# else
#     echo "$myport"
# fi