fswebcam: 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/fswebcam - from package: fswebcam

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

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