lz: 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/lz - from package: mtools

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

On Debian possible default full paths are:

/usr/bin/lz - from package: mtools

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

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