atdcat: 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/atdcat - from package: libatd-ocaml-dev

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

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