pqiv: command not found

Have You tried accessing the binary with the full path?

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/pqiv - from package: pqiv

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