vidcat: 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/vidcat - from package: w3cam

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

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