[GUIDE][TUT] Learn basic scripting, busybox commands, how to execute scripts

First we must to learn what is busybox. BusyBox is software that provides several stripped-down Unix tools in a single executable file. It runs in a variety of POSIX environments such as Linux, Android.
Busybox allows you or programs to perform actions on your phone using Linux (copied from Unix) commands. Android is basically a specialized Linux OS with a Java compatible (Dalvik) machine for running programs. The Android kernel is a modified version of the Linux kernel (that is why the Android kernel must always be open source). Busybox gives functionality to your phone that it does not have without it. Many programs, especially root programs such as Titanium Backup, require busybox to perform the functions of the program. Without busybox installed your phone is much more limited in what it can do.

Here is some info about busybox, you can track here release dates, you can download sources...
http://spblinux.de/2.0/doc/commands.html
Also here is busybox installer for our "linux devices" heheh ^~^ by stericson. You have two versions of it as you see paid and free. :D
Chose paid if you want to donate him for awesome job.

Free:
https://play.google.com/store/apps/d...ricson.busybox
Paid(PRO):
https://play.google.com/store/apps/d...busybox.donate


After that you need Terminal app, you can download it from playstore too.
Link: Download it from here :)
This app emulates Linux terminal, with it you can access to android shell.
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As you see here in a picture, this is main shell window.
Lets's start with learning basic terminal stuff

The most of shell commands doesn't need root access, but some of them are need it.
To give root access to the terminal app, you need to type next.
After pressing enter, another window will popup to grant root access. Tap on GRANT
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***When you typing something into the terminal window, take care because EVERYTHING IS CASE SENSITIVE.***

Let's go trough basic shell commands. :D :D :D

If you interested about all commands, you can check them HERE.


cat [file destination] - use this command to print everything from a file to the terminal window

Example:
Open terminal window, and type next:
On second pic is the output which you will get after pressing enter.
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Now, you can see here, if you open any file manager and go to destination which was given for example "/proc/meminfo"
You will see next file and stuff inside it :)
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Heheh, is it same?? ^~^ for sure that it is, you can use it for any file on your device which have text in it.
Let's go to the next basic command ^~^


echo - this command can be used for printing arguments to stdout. Also you can use it for adding text in already existing file which we need here, because we are learning scripting stuff, right? ^~^

Example:
Open terminal window, and type next:
Ok, let's explain this.
First you added a command echo to add something in existing file, then between "..." we need to put arguments, for our case this is "Scripting is awesome" next we see symbol " > " which will forward arguments to next added direction, in our case this is "/sdcard/test".

First we need to have a existing file (IMPORTANT)
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After we agreed with that we have a file
Open terminal as I already explained and after pressing enter you will get thing which is on second pic.
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That is a file from our /sdcard/
Don't delete this file, we will use it later with " sh" command.
Let's go to the next basic command :D


clear - Use this comand to clear whole terminal window.

Example:
You have a terminal window which have a lot of stuff on it, for example stuff from previous lines, text, etc.
You can simply make it blank with just one command
And voila, terminal window is blank ;)


touch [file destination - Use this command to create a blank file on any destination on your android device.

Example:
Open terminal window, and type next:
This will create file called "scripting_007" on "/sdcard/" in this case, you can put any.

Let's try and here you are pics what will happen and see results on second pic.
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As you can see file "scripting_007" exist on /sdcard/


mkdir [file destination] - Use this command to create one empty folder on any destination on your android device.

Example:
Open terminal window, and type next:
This will create folder called "development" on "/sdcard/" in this case, you can put any.


sh [path of a file] - Use this command to execute basic script

Example:
Open terminal window, and type next:
This will execute file which you make before with "echo" command :D

sleep [time in secs] - Use this command to make an offset between executing lines inside script.

Example:
Open terminal window, and type next:
This is a combination of two commands as you can see, echo and sleep.
After launching this simple script in terminal window you will get first "Scripting is" and after 10 secs you will get awesome. :)

Now, let's go with some advanced stuff

You need any text editor, I suggesting this one
Link: Download from here :)

Now, open the app and write a new file and give it a name "test1"
Inside a file write next text:
Save the file and copy it to some location, i suggest /sdcard/.

Open up terminal emulator and type next
This thing will execute your script with the name test1 from /sdcard/.
Output will be "Android", then after two seconds will appear "is" and then after two more seconds "Awesome" will appear. THATS IT!!! You learned how to make a file (script) and how to execute it with terminal emulator. :D


Now do the same thing make a file with the name "test2" and make another file with a name "print"
First open "test1" and write next:
I think that you already know whats happened here :D
You have print, then you have sleep to make offset, and after that you have clear command to make window blank :D

Now open file with the name "print"
Inside it write next:
Save this file, and open terminal emulator, and write next:
And magic happens :D
In this example you learned how to execute second file with first, I think that it's not difficult for you :D


In this example we will play a bit with colors outputs :D
Codes for colors are below
Try to copy this into terminal window and see what will happened or try whing which you learned before with the executing files. Copy whole code to a file and execute it with "sh" command. :D USE YOUR KNOWLEDGE. :D

Here you can see all things based on bash script coloring :D
https://wiki.archlinux.org/index.php/Color_Bash_Prompt
or
http://misc.flogisoft.com/bash/tip_c...and_formatting
Here you can see all codes and it's nice descirbed. :D

Now, let's start :)

Make a file with the name "test3" open it and write or copy next code inside:
As you can see this part was taken from mine L Speed performance/battery mod :D
Save the file, open terminal and type inside
And you will get the same screen like in first L Speed menu.
Let's play a bit with this :)

You see the code
Just change one number instead of 41 write 42 and you will get green color, then give a try to other nubers. Every number is another color for example:




Donation:
http://forum.xda-developers.com/dona....php?u=5514152



More will come soon, thread is in building. :)

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