nohup wrapper to run a command separate from the TTY and without any output

qnohup.sh

#!/bin/sh

if [ -z "$1" ] || [ "$1" = '--help' ]; then
	echo 'nohup wrapper to run a program separate from the TTY' \
	     'and without any output'
	echo
	echo "Read 'man nohup' for further info"
	exit 1
elif echo "$1" | grep -q '/'; then
	if [ ! -f "$1" ]; then
		echo "ERROR: '$1' is not found"
		exit 2
	elif [ ! -x "$1" ]; then
		echo "ERROR: '$1' is not executable"
		exit 3
	fi
elif ! which "$1" >/dev/null 2>&1; then
	echo "ERROR: '$1' is not found in PATH"
	exit 4
fi

nohup $* >/dev/null 2>&1 &