7zG: 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/7zG - from package: p7zip-gui

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

Error in other languages:
7zG: bevel nie gevind nie
7zG: comandă negăsită
7zG: comando não encontrado
7zG: commande introuvable
7zG: command not found
7zG: käsku ei ole
7zG: không tìm thấy lệnh
7zG: komanda nerasta
7zG: Kommando nicht gefunden.
7zG: kommandot finns inte
7zG: komut yok
7zG: nie znaleziono polecenia
7zG: níor aimsíodh an t-ordú
7zG: no se encontró la orden
7zG: no s'ha trobat l'ordre
7zG: opdracht niet gevonden
7zG: parancs nem található
7zG: perintah tidak ditemukan
7zG: príkaz nenájdený
7zG: příkaz nenalezen
7zG: команда не найдена
7zG: командата не е открита
7zG: 命令找不到
7zG: コマンドが見つかりません