kmenuedit: 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/kmenuedit - from package: kdebase-workspace

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

On Debian possible default full paths are:

/usr/bin/kmenuedit - from package: kmenuedit

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

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