get-client-ip-list: 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/share/drbl/bin/get-client-ip-list - from package: drbl

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

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