perm: 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/perm - from package: perm

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

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