lbzegrep: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/lbzegrep - from package: lbzip2-utils

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