dmxrminput: 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/dmxrminput - from package: xorg-x11-server-Xdmx

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

On Debian possible default full paths are:

/usr/bin/dmxrminput - from package: xdmx-tools

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

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