arename: 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/arename - from package: arename

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

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