numrange: 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/numrange - from package: num-utils

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

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