vcheck: 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/vcheck - from package: vcheck

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

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