serviceconf: 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/serviceconf - from package: system-config-services
/usr/sbin/serviceconf - from package: system-config-services

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

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