Faster alternative to vncserver script

vnc

#!/bin/sh

# Output PID of process listening on given port
pid_of_port() {
  netstat -ntpl 2>/dev/null | \
  PORT=$1 awk 'substr($4, match($4, "[0-9]*$")) == ENVIRON["PORT"] {
      print substr($7, 0, match($7, "/") - 1)}'
}

success() {
  local p=$(pid_of_port $(( 5900 + $next )))
  [ "$p" = "$pid" ] && return 0 || return 1
}

vnc_dir="$HOME/.vnc"
log=$(mktemp --tmpdir="$vnc_dir")

startVNC() {
  Xvnc ":$next" \
    -depth 24 \
    -rfbauth "$HOME/.vnc/passwd" \
    > "$log" \
    2>&1 &
  pid=$!
}

next=0
startVNC

while ! success; do
  if [ -z "$(pgrep -P $$)" ]; then
    next=$(( next + 1 ))
    startVNC
  fi
done

prefix="$vnc_dir/$(hostname):$next"
mv  "$log"  "$prefix.log"
echo $pid > "$prefix.pid"

export DISPLAY=:$next
xsetroot -solid darkgrey
x-window-manager >/dev/null 2>&1 &
echo :$next