pcv: 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/pcv - from package: picviz

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

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