gnome-control-center: 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/gnome-control-center - from package: control-center-extra

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

On Debian possible default full paths are:

/usr/bin/gnome-control-center - from package: gnome-control-center

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

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