Silent option for console install

[SGLG]

I have a project (soon to be many projects technically) that involve fetching the latest I2P installer on first run using bash. The whole process is automated for the end user, except for the I2P install itself. The user has to input options. I've tried a few workarounds in bash but they don't work. It would be very useful is the installer had an option to install silently. Maybe assume 1 on first prompt, empty on second, and 1 on third. Or maybe, even better, would be the option to specify the inputs (or at least the second input) in the command along with -console. This enhancement would allow for scripts to automate the install of I2P without the need of user input.

For the sake of completeness, the projects in question are:
​https://github.com/IITFA/i2pgetterlinux
​https://github.com/IITFA/i2pbundlelin64 (uses the i2pgetter script)

[zzz]

Works as documented at ​http://zzz.i2p/topics/721

echo 'INSTALL_PATH=/path/to/install/dir' > /tmp/foo
java -jar i2pinstall_0.9.xx.jar -options /tmp/foo
rm -f /tmp/foo

retested on .38, .39, and .40 (izpack 4) and with new izpack 5 installer for .41