lzegrep: 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/lzegrep - from package: xz-lzma-compat

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

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