proguard: 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/proguard - from package: proguard

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

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