pbzip2: 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/pbzip2 - from package: pbzip2

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

On Debian possible default full paths are:

/usr/bin/pbzip2 - from package: pbzip2

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

Error in other languages:
pbzip2: bevel nie gevind nie
pbzip2: comandă negăsită
pbzip2: comando não encontrado
pbzip2: commande introuvable
pbzip2: command not found
pbzip2: käsku ei ole
pbzip2: không tìm thấy lệnh
pbzip2: komanda nerasta
pbzip2: Kommando nicht gefunden.
pbzip2: kommandot finns inte
pbzip2: komut yok
pbzip2: nie znaleziono polecenia
pbzip2: níor aimsíodh an t-ordú
pbzip2: no se encontró la orden
pbzip2: no s'ha trobat l'ordre
pbzip2: opdracht niet gevonden
pbzip2: parancs nem található
pbzip2: perintah tidak ditemukan
pbzip2: príkaz nenájdený
pbzip2: příkaz nenalezen
pbzip2: команда не найдена
pbzip2: командата не е открита
pbzip2: 命令找不到
pbzip2: コマンドが見つかりません