swac-get: 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/swac-get - from package: swac-get

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

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