cdfsigi: 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 Debian possible default full paths are:

/usr/bin/cdfsigi - from package: cdftools

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

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