scl_enabled: 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/scl_enabled - from package: scl-utils

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

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