atmtcp: 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/sbin/atmtcp - from package: atm-tools

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

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