dblook: 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/dblook - from package: derby-tools

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

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