rarian-example: 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/rarian-example - from package: rarian

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

On Debian possible default full paths are:

/usr/bin/rarian-example - from package: rarian-compat

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

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