I am looking to clear space on /system on my Android device. It turns out that /system/app is using almost 35% of the space on /system. I find that if I delete an apk from /system/app, nothing seems to happen to the application. It does not get uninstalled, and it still runs fine. Therefore, what is the role of /system/app ? Is it some sort of cache? Can I clear everything in it?
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This is off topic here, but I’m answering to prevent a disaster in your phone:
it is the folder where the system apps reside!!!
You may be OK removing one or two unused APKs, but if you remove anything else, your phone will be useless.
BTW, next time, try android.stackexchange.com
Grab Titanium Backup app from the market, and make a full backup of the system apps. You can then start deleting some apps from the system folder, and use the backup in case you need it back.
There’s even a “create an update.zip” option to add a recovery zip in case you cannot even boot.
The reason you see some apps still running is because you probably have another installation in /data/app , most probably some update from the market.