git

It was a big relief to see git. At last, I need not maintain a central repository and the git commands seemed so simple....

Once I went back to an older version - alas, all the later versions were lost. After reading some books in git, I realised that I should have branched from an older version. Thus if you are planning to experiment, it is better to branch to a new branch and experiment. If the experiment is successful, you can merge back into main stream. So easy!

The branch command is:

git branch branch_name tag_name(or commit hash)

to checkout the branch

git checkout branch_name

It is extremely comfortable to checkout branch and then merge into...

git merge for merging and for visualization of log, one can use
git log --graph --pretty=oneline --abbrev-commit

Now the eclipse git plugin provides branche/merge etc...making life more comfortable!

Thank you Linus Torvalds