zconfig: 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/zconfig - from package: python-zconfig

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