dpns-listusrmap: 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 CentOS possible default full paths are:

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

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

On Debian possible default full paths are:

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

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