atst-long: command not found

Have You tried accessing the binary with the full path?

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/atst-long - from package: scotch

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