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How to rename filenames to their corresponding md5 hash on mac ?

The following command in terminal app renames the files located in directory to their corresponding md5 hash on macOS. 
Steps:
1. Open Terminal.app and go to the directory containing files. 2. Run following command in terminal to rename files by MD5 on macOS.

macOS-system$ for F in *.*; do mv $F "$(md5 "$F" | cut -d' ' -f4).${F##*.}"; done
The above shell command renames all files in the current directory to their md5.

How to make java point to right version of java on your Mac ?

A usual problem on mac where the even after upgrading or installing the latest version of Java, when queried in command line for java version it still refers to the old version of java. something like below:
$ java -version java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

This is because the /usr/bin/java is pointing to  /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java on the system.
$ ls -la `which java` /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java

This is because Oracle's installer puts java inside the/Library/Internet Plug-Ins/JavaAppletPlugin.plugin. And it doesn't overwrite /usr/bin/java. So to fix this we have remove the existing soft link to old java and point it to new java binary. which can be done by performing following steps.

$ sudo rm /usr/bin/java
$ sudo ln -s /Library/Internet\ Plug-Ins/JavaApplet…

How to fix broken python module easy_install on mac ?

Easy Install is a python module (easy_install) bundled with setuptools that lets you automatically download, build, install, and manage Python packages. Sometimes due wrong installations easy_install might get corrupted and fail to install any package afterwords. You might see errors like below when you try to install any modules
Traceback (most recent call last):   File "/usr/local/bin/easy_install", line 7, in     from setuptools.command.easy_install import main   File "/Library/Python/2.7/site-packages/setuptools/__init__.py", line 12, in     import setuptools.version   File "/Library/Python/2.7/site-packages/setuptools/version.py", line 1, in     import pkg_resources   File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 72, in     import packaging.requirements   File "/Library/Python/2.7/site-packages/packaging/requirements.py", line 59, in     MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker"…