pv_import: 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/pv_import - from package: csound-utils

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

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