bzcat: 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/bzcat - from package: bzip2

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

On Debian possible default full paths are:

/bin/bzcat - from package: bzip2

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

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