genrb: 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/genrb - from package: icu

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

On Debian possible default full paths are:

/usr/bin/genrb - from package: icu-devtools

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

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