sscep: 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/sscep - from package: sscep

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

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