dupemap: 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/dupemap - from package: magicrescue

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

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