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

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

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