scponly: 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/scponly - from package: scponly

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

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