wmshutdown-run: 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/wmshutdown-run - from package: wmshutdown

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

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