lbzgrep: 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/lbzgrep - from package: lbzip2-utils

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

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