debirf: 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/debirf - from package: debirf

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

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