lbzfgrep: 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 CentOS possible default full paths are:

/usr/bin/lbzfgrep - from package: lbzip2-utils

You may install the required package with command yum install {package}

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