Git diff using meld, a graphical file comparator

1. First, install meld (or from source : http://meldmerge.org)
   sudo apt-get install meld
   
   2. Then, create a directory named script in home folder
   cd ~; mkdir script; cd script;
   
   3. Create a file and name it git_meld.py
   touch git_meld.py
   
   4. Insert the following codes :
   
   #!/usr/bin/python
   
   import sys
   import os
   
   os.system(‘meld “%s” “%s”’ % (sys.argv[2], sys.argv[5]))
   
   5. Save the file.
   
   6. Then, set git to use this script as part of ‘diff’ command
   git config –global diff.external /home/script/git_meld.py
   
   That’s it, we’re done. Use git diff as the following
   
   // compares working directory with index
   // i.e. shows the changes that are not staged yet.
   git diff
   
   // compares working directory with local repository.
   // shows the list of changes after your last commit.
   git diff HEAD
   
   // compares index with local repository.
   // shows the diff between your last commit and changes to be committed next (already staged, but not yet commited)
   git diff –cached
   Full manual available :
   https://www.kernel.org/pub/software/scm/git/docs/git-diff.html
   
   If you want to compare between 2 commits, use
   git log and then copy the commit ID of the 2 commits you want to compare
   i.e.
   commit 8c9dcaa5424a67ddf20cd453bcb6db4c5b04edbf — copy this
   Author: Raf
   Date:   Sat Sep 3 17:49:19 2016 +0800
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   And then, run the following
   git diff [commitA] [commitB]</div><div>
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