rapid-photo-downloader: 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/rapid-photo-downloader - from package: rapid-photo-downloader

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

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