rrdedit: 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/rrdedit - from package: netmrg

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

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