Boot Shell can execute Linux Shell commands and Shell Script Files(*.sh/*.txt) [Pro Version] at boot. It also has a very simple terminal built-in [PRO only].

Boot Shell act as an alternative for devices which have ROMs/Kernels without init.d support.

It does not have any predefined functions, but the commands you enter can make it a very versatile app with wide set of possibilities.

Some of its possible applications -
-Trim file system (fstrim utility, fix lags)
-Tweak GPU, CPU, I/O, Display parameters
-Load kernel modules
and a lot more

You can add any number of shell commands or script files, which can be executed at boot. That's not all, you can also save commands as favourites that you intend to use frequently, but don't want it to be executed at every boot. You can execute them any time you want from this app.

Completely ad/spam free and will always be.

█ Prerequisites -
-Root
-Busybox

Explanation for Permissions -

-> Read/Write USB Storage - Allow the Shell commands to read/write on Device Storage, modify execute script files
-> Run at Startup - To be able to execute Shell commands at Boot

Check out the Pro version with extra features -
-Execute script files at boot or whenever you need it from the app.
-Inbuilt Script/Text Editor.
-Built-in terminal

Recent changes:
Version 4.0 -> 11 Aug 2016

- Re-wrote the whole app from scratch
- Whole new UI, easier to save/edit/run commands
- Light/dark themes
- Android N compatibility
- New Built-in basic terminal (Pro only)
* Sorry for the fugly icon ( ͡ຈ╭͜ʖ╮͡ຈ )