bzfgrep: 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/bzfgrep - from package: bzip2

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

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