sgscan: 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/sgscan - from package: sagator-core

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

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