pvdataserver: 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/pvdataserver - from package: paraview

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

On Debian possible default full paths are:

/usr/bin/pvdataserver - from package: paraview

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

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