bzegrep: 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:

/bin/bzegrep - from package: bzip2

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

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