webspy: 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/webspy - from package: dsniff

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

On Debian possible default full paths are:

/usr/sbin/webspy - from package: dsniff

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

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