atsopt: 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/atsopt - from package: ats-lang-anairiats
/usr/lib/ats-anairiats-0.2.11/bin/atsopt - from package: ats-lang-anairiats

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

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