metacam: command not found

Have You tried accessing the binary with the full path?

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/metacam - from package: metacam

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