gnome-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/gnome-commander - from package: gnome-commander

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

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