w3camd: 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/sbin/w3camd - from package: w3cam

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

Error in other languages:
w3camd: bevel nie gevind nie
w3camd: comandă negăsită
w3camd: comando não encontrado
w3camd: commande introuvable
w3camd: command not found
w3camd: käsku ei ole
w3camd: không tìm thấy lệnh
w3camd: komanda nerasta
w3camd: Kommando nicht gefunden.
w3camd: kommandot finns inte
w3camd: komut yok
w3camd: nie znaleziono polecenia
w3camd: níor aimsíodh an t-ordú
w3camd: no se encontró la orden
w3camd: no s'ha trobat l'ordre
w3camd: opdracht niet gevonden
w3camd: parancs nem található
w3camd: perintah tidak ditemukan
w3camd: príkaz nenájdený
w3camd: příkaz nenalezen
w3camd: команда не найдена
w3camd: командата не е открита
w3camd: 命令找不到
w3camd: コマンドが見つかりません