gpiv_piv2hdf: 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 Debian possible default full paths are:

/usr/bin/gpiv_piv2hdf - from package: gpivtools-mpi
/usr/bin/gpiv_piv2hdf - from package: gpivtools

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

Error in other languages:
gpiv_piv2hdf: bevel nie gevind nie
gpiv_piv2hdf: comandă negăsită
gpiv_piv2hdf: comando não encontrado
gpiv_piv2hdf: commande introuvable
gpiv_piv2hdf: command not found
gpiv_piv2hdf: käsku ei ole
gpiv_piv2hdf: không tìm thấy lệnh
gpiv_piv2hdf: komanda nerasta
gpiv_piv2hdf: Kommando nicht gefunden.
gpiv_piv2hdf: kommandot finns inte
gpiv_piv2hdf: komut yok
gpiv_piv2hdf: nie znaleziono polecenia
gpiv_piv2hdf: níor aimsíodh an t-ordú
gpiv_piv2hdf: no se encontró la orden
gpiv_piv2hdf: no s'ha trobat l'ordre
gpiv_piv2hdf: opdracht niet gevonden
gpiv_piv2hdf: parancs nem található
gpiv_piv2hdf: perintah tidak ditemukan
gpiv_piv2hdf: príkaz nenájdený
gpiv_piv2hdf: příkaz nenalezen
gpiv_piv2hdf: команда не найдена
gpiv_piv2hdf: командата не е открита
gpiv_piv2hdf: 命令找不到
gpiv_piv2hdf: コマンドが見つかりません