numrandom: 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/numrandom - from package: num-utils

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

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