update-rt-siteconfig-4: 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/sbin/update-rt-siteconfig-4 - from package: request-tracker4

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

Error in other languages:
update-rt-siteconfig-4: bevel nie gevind nie
update-rt-siteconfig-4: comandă negăsită
update-rt-siteconfig-4: comando não encontrado
update-rt-siteconfig-4: commande introuvable
update-rt-siteconfig-4: command not found
update-rt-siteconfig-4: käsku ei ole
update-rt-siteconfig-4: không tìm thấy lệnh
update-rt-siteconfig-4: komanda nerasta
update-rt-siteconfig-4: Kommando nicht gefunden.
update-rt-siteconfig-4: kommandot finns inte
update-rt-siteconfig-4: komut yok
update-rt-siteconfig-4: nie znaleziono polecenia
update-rt-siteconfig-4: níor aimsíodh an t-ordú
update-rt-siteconfig-4: no se encontró la orden
update-rt-siteconfig-4: no s'ha trobat l'ordre
update-rt-siteconfig-4: opdracht niet gevonden
update-rt-siteconfig-4: parancs nem található
update-rt-siteconfig-4: perintah tidak ditemukan
update-rt-siteconfig-4: príkaz nenájdený
update-rt-siteconfig-4: příkaz nenalezen
update-rt-siteconfig-4: команда не найдена
update-rt-siteconfig-4: командата не е открита
update-rt-siteconfig-4: 命令找不到
update-rt-siteconfig-4: コマンドが見つかりません