sigul_bridge: 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/sigul_bridge - from package: sigul

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

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