kdb-full: 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/kdb-full - from package: elektra-tests

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

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