ketchup: 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 Debian possible default full paths are:

/usr/bin/ketchup - from package: ketchup

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

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