wsdl: 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/wsdl - from package: mono-web

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

On Debian possible default full paths are:

/usr/bin/wsdl - from package: mono-devel

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

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