ql-lun-state-online: 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/sbin/ql-lun-state-online - from package: qla-tools

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

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