Just trying to enchance my knowledge of git and use to tips and tricks,
I updated my .bashrc file as suggested in Tip PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
but to my surprise now my git branch command is not working and even if I remove it from .bashrc than also it is not working for me.
Also every time, I use my command prompt I get -bash: __git_ps1: command not found any guidance or suggestions ?
Update : I want to get rid of it now, how can I achieve this ?
Have you enabled the git bash-completion functions? You may find them on your system already, just not enabled.
To work out whether they're on or not, hit tab after typing git<space> -- if you get a list of files, you don't have completion, if you get a list of commands, you do (and your prompt should work).
Update: Once you've removed the line from your .bashrc, the issues you've been experiencing should go away once you've restarted your shell. Merely re-sourcing the file won't help, as it doesn't un-set the prompt variable (and in any case, that variable did have a value before you overrode it).
By googling for "__git_ps1", I found the first result which says:
There is already a function to do this in the git distribution. If you check out the source there is a directory called contrib which has a bash completion file that gives you a __git_ps1 function.
So sounds like you need to go find that contrib/ file and source it in your bash profile!