perm3: 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/perm3 - from package: ladr4-apps

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

Error in other languages:
perm3: bevel nie gevind nie
perm3: comandă negăsită
perm3: comando não encontrado
perm3: commande introuvable
perm3: command not found
perm3: käsku ei ole
perm3: không tìm thấy lệnh
perm3: komanda nerasta
perm3: Kommando nicht gefunden.
perm3: kommandot finns inte
perm3: komut yok
perm3: nie znaleziono polecenia
perm3: níor aimsíodh an t-ordú
perm3: no se encontró la orden
perm3: no s'ha trobat l'ordre
perm3: opdracht niet gevonden
perm3: parancs nem található
perm3: perintah tidak ditemukan
perm3: príkaz nenájdený
perm3: příkaz nenalezen
perm3: команда не найдена
perm3: командата не е открита
perm3: 命令找不到
perm3: コマンドが見つかりません