newrole: 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 CentOS possible default full paths are:

/usr/bin/newrole - from package: policycoreutils-newrole

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/newrole - from package: policycoreutils

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

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