dzgrep: 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/dzgrep - from package: debian-goodies

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

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