gnome-desktop-item-edit: 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-desktop-item-edit - from package: gnome-panel

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

On Debian possible default full paths are:

/usr/bin/gnome-desktop-item-edit - from package: gnome-panel

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

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