restore centos to inital install

yum.sh

 
If everything was installed via the yum package manager, you can undo previous commands:
# Get all yum commands previously run
yum history list all

# Get the details of the command
yum history info [entry number]

# Undo each command top-down
yum history undo [entry number]
after the comands remove the traces and trash :
find / -name .DS_Store -print0 | xargs -0 rm -rf

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https://gist.github.com/tallesairan/e209d70bbaf7adabd63bcd4a5470ed75