gwc: 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/gwc - from package: geneweb

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

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