atsdoc: 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/lib/ats-anairiats-0.2.11/bin/atsdoc - from package: ats-lang-anairiats

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

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