wdmd: 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/sbin/wdmd - from package: sanlock

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

On Debian possible default full paths are:

/usr/sbin/wdmd - from package: sanlock

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

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