wmdocker: 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/wmdocker - from package: docker

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

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