Replacement for the unix wall command, which also works with gnome-terminal

wall.sh

#!/bin/bash

usage="
Usage:
 wall [options] [message]

Write a message to all users.

Options:
 -n, --nobanner          do not print banner
 -h, --help              display this help and exit
"

SHORT=nh
LONG=nobanner,help

PARSED=$(getopt --options $SHORT --longoptions $LONG --name "$0" -- "$@")
if [[ $? -ne 0 ]]; then
    echo "$usage"
    exit 2
fi
eval set -- "$PARSED"

while true; do
    case "$1" in
        -n|--nobanner)
            n=y
            shift
            ;;
        -h|--help)
            echo "$usage"
            exit 0
            ;;
        --)
            shift
            break
            ;;
        *)
            exit 3
            ;;
    esac
done

ps -ef | grep " pts/" | awk '{print $6}' | sort -u > terminals_list.temp
ps -ef | grep " tty" | awk '{print $6}' | sort -u | grep -v "pts" >> terminals_list.temp
if [ "$n" ]; then
    pre=""
    post=""
else
    pre="-e \nBroadcast message from $(whoami)@$(hostname) ($(ps ax | grep "^$$" | awk '{ print $2 }')) ($(date +"%a %b %d %H:%M:%S %Y")):\n\n"
    post="\n"
fi
cat terminals_list.temp | while read TTY_TO; do echo $pre"$*"$post | sudo tee /dev/$TTY_TO 1>/dev/null; done
rm terminals_list.temp