collectiongain: 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/collectiongain - from package: python-rgain

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

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