wdread: 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/wdread - from package: WindowMaker

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

On Debian possible default full paths are:

/usr/bin/wdread - from package: wmaker

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

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