atfsit: 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/atfsit - from package: atfs

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

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