wcw: 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/wcw - from package: winswitch

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

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