grenum: 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/grenum - from package: geda-utils

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

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