scponlyc: 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/sbin/scponlyc - from package: scponly

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

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