gvizify: 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/gvizify - from package: ladr4-apps

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

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