commander: 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/commander - from package: ruby-commander

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

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