dpns-rmusrmap: 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 CentOS possible default full paths are:

/usr/bin/dpns-rmusrmap - from package: dpm

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/dpns-rmusrmap - from package: dpm

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

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