bzip2: 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/bzip2 - from package: bzip2

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

On Debian possible default full paths are:

/bin/bzip2 - from package: bzip2

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

Error in other languages:
bzip2: bevel nie gevind nie
bzip2: comandă negăsită
bzip2: comando não encontrado
bzip2: commande introuvable
bzip2: command not found
bzip2: käsku ei ole
bzip2: không tìm thấy lệnh
bzip2: komanda nerasta
bzip2: Kommando nicht gefunden.
bzip2: kommandot finns inte
bzip2: komut yok
bzip2: nie znaleziono polecenia
bzip2: níor aimsíodh an t-ordú
bzip2: no se encontró la orden
bzip2: no s'ha trobat l'ordre
bzip2: opdracht niet gevonden
bzip2: parancs nem található
bzip2: perintah tidak ditemukan
bzip2: príkaz nenájdený
bzip2: příkaz nenalezen
bzip2: команда не найдена
bzip2: командата не е открита
bzip2: 命令找不到
bzip2: コマンドが見つかりません