twatch: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/twatch - from package: twatch

You may install the required package with command apt-get install {package}

Error in other languages:
twatch: bevel nie gevind nie
twatch: comandă negăsită
twatch: comando não encontrado
twatch: commande introuvable
twatch: command not found
twatch: käsku ei ole
twatch: không tìm thấy lệnh
twatch: komanda nerasta
twatch: Kommando nicht gefunden.
twatch: kommandot finns inte
twatch: komut yok
twatch: nie znaleziono polecenia
twatch: níor aimsíodh an t-ordú
twatch: no se encontró la orden
twatch: no s'ha trobat l'ordre
twatch: opdracht niet gevonden
twatch: parancs nem található
twatch: perintah tidak ditemukan
twatch: príkaz nenájdený
twatch: příkaz nenalezen
twatch: команда не найдена
twatch: командата не е открита
twatch: 命令找不到
twatch: コマンドが見つかりません