gcx: 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/gcx - from package: gcx

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

On Debian possible default full paths are:

/usr/bin/gcx - from package: gcx

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

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