siggen: 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/siggen - from package: tripwire

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

On Debian possible default full paths are:

/usr/sbin/siggen - from package: tripwire
/usr/bin/siggen - from package: siggen

You may install the required package with command apt-get install {package}

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