Unzip games with specific encodings

Some games are distributed in .zip packages. Lots of these have file names with non-ASCII encoding characters.

Most zip files are not using Unicode, so they need a special procedure to be unpacked properly.

Unpack and convert from GNU/Linux and other UNIX

Requirements:

Commands for specific encodings:

LANG=ja_JP 7za x filename.zip
cd gamefolder
convmv --notest -f shiftjis -t utf8 -r *

LANG=zh_HK 7za x filename.zip
cd gamefolder
convmv --notest -f cp950 -t utf8 -r *

Alternatively, zh_TW and other should work fine too.