On LineageOS (and Android in general), you can find the user ID (UID) associated with a specific app using several methods. Here are the most common approaches:

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1. Using ADB (Android Debug Bridge)

If you have ADB access (USB debugging enabled on the device), you can use the following command:

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adb shell dumpsys package <package_name> | grep userId

Replace <package_name> with the actual package name of the app (e.g., com.android.chrome).

• This will output information including the userId associated with the app.

Example:

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adb shell dumpsys package com.android.chrome | grep userId

Look for a line like:
userId=10123

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2. Using the pm list packages Command

You can list all packages and their UIDs with:

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adb shell pm list packages -U

• This will show all installed packages along with their UIDs.

Example output:

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package:com.android.chrome 10123

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3. Checking /data/system/packages.list

If you have root access, you can check the file:

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adb shell cat /data/system/packages.list

• This file contains mappings of package names to UIDs.

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4. Using a File Manager with Root Access

If your device is rooted, you can navigate to:

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/data/system/packages.list

or

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/data/system/packages.xml

• These files contain the UID for each installed app.

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5. Using the ps Command

You can also check running processes and their UIDs:

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adb shell ps -A | grep <package_name>

• The third column in the output is the UID.

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6. Using the aapt Tool (for APK files)

If you have the APK file, you can use aapt to dump the manifest and find the UID (though this only works for system apps with fixed UIDs):

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aapt dump badging <path_to_apk> | grep uid

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Notes:

• Non-root users can only see UIDs for their own apps or system apps.
• Root access is required to see UIDs for all apps.
• UIDs are unique per user on multi-user devices. The main user is usually 0.