gxine_client: 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 CentOS possible default full paths are:

/usr/bin/gxine_client - from package: gxine

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gxine_client - from package: gxine

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

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