predate: 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/predate - from package: qmail
/var/lib/qmail/bin/predate - from package: qmail

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

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