dmxwininfo: 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/dmxwininfo - 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/dmxwininfo - from package: xdmx-tools

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

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