#!/bin/sh
if [ $# -ne 1 ]; then
  echo "Usage: setuserportmin PORT"
else
  grep -q "^net.ipv4.ip_unprivileged_port_start=" /etc/sysctl.conf && \
  sed -i "s/^net.ipv4.ip_unprivileged_port_start=.*/net.ipv4.ip_unprivileged_port_start=$1/" /etc/sysctl.conf || \
  echo "net.ipv4.ip_unprivileged_port_start=$1" | tee -a /etc/sysctl.conf
  sysctl -w net.ipv4.ip_unprivileged_port_start=$1
fi
