gparted: 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/gparted - from package: gparted
/usr/sbin/gparted - from package: gparted

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

On Debian possible default full paths are:

/usr/sbin/gparted - from package: gparted

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

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