reniced: 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/reniced - from package: reniced

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

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