psignifit: 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/psignifit - from package: psignifit

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

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