dib3000-watch: 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/dib3000-watch - from package: dvb-apps

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

Error in other languages:
dib3000-watch: bevel nie gevind nie
dib3000-watch: comandă negăsită
dib3000-watch: comando não encontrado
dib3000-watch: commande introuvable
dib3000-watch: command not found
dib3000-watch: käsku ei ole
dib3000-watch: không tìm thấy lệnh
dib3000-watch: komanda nerasta
dib3000-watch: Kommando nicht gefunden.
dib3000-watch: kommandot finns inte
dib3000-watch: komut yok
dib3000-watch: nie znaleziono polecenia
dib3000-watch: níor aimsíodh an t-ordú
dib3000-watch: no se encontró la orden
dib3000-watch: no s'ha trobat l'ordre
dib3000-watch: opdracht niet gevonden
dib3000-watch: parancs nem található
dib3000-watch: perintah tidak ditemukan
dib3000-watch: príkaz nenájdený
dib3000-watch: příkaz nenalezen
dib3000-watch: команда не найдена
dib3000-watch: командата не е открита
dib3000-watch: 命令找不到
dib3000-watch: コマンドが見つかりません