How to Edit Files Inside the Android Adb Shell

How to copy and edit files in Android shell?

The most common answer to that is simple: Bundle few apps (busybox?) with your APK (assuming you want to use it within an application). As far as I know, the /data partition is not mounted noexec, and even if you don't want to deploy a fully-fledged APK, you could modify ConnectBot sources to build an APK with a set of command line tools included.

For command line tools, I recommend using crosstool-ng and building a set of statically-linked tools (linked against uClibc). They might be big, but they'll definitely work.

Create *.txt file through ADB with specific content inside

adb shell
echo "Hello world" > /sdcard/file.txt

How to clear a file via adb?

This should clear the file, removing every text in the file:

adb shell "> /path/to/file"

How to edit /etc/hosts file in Android Studio emulator running in nougat?

I was able to edit the /etc/hosts file by launching the emulator with -writable-system and remounting the emulator using adb remount. After that the hosts file inside the emulator is editable. I tried pushing/replacing the file and succeeded.

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