prefield: command not found

Have You tried accessing the binary with the full path?

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/prefield - from package: stda

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