atst-int32: 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/lib/debug/usr/bin/atst-int32 - from package: scotch-dbg
/usr/bin/atst-int32 - from package: scotch

You may install the required package with command apt-get install {package}
Error in other languages:
atst-int32: bevel nie gevind nie
atst-int32: comandă negăsită
atst-int32: comando não encontrado
atst-int32: commande introuvable
atst-int32: command not found
atst-int32: käsku ei ole
atst-int32: không tìm thấy lệnh
atst-int32: komanda nerasta
atst-int32: Kommando nicht gefunden.
atst-int32: kommandot finns inte
atst-int32: komut yok
atst-int32: nie znaleziono polecenia
atst-int32: níor aimsíodh an t-ordú
atst-int32: no se encontró la orden
atst-int32: no s'ha trobat l'ordre
atst-int32: opdracht niet gevonden
atst-int32: parancs nem található
atst-int32: perintah tidak ditemukan
atst-int32: príkaz nenájdený
atst-int32: příkaz nenalezen
atst-int32: команда не найдена
atst-int32: командата не е открита
atst-int32: 命令找不到
atst-int32: コマンドが見つかりません