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A comment on Why I Switched to Git From Mercurial. Parent comment

Re:Why I Switched to Git From Mercurial by charlesmarshall on Monday May 17, 2010 @12:12PM (#1354660)
you can use commands like git filter-branch & git rebase to change your history - http://www-cs-students.stanford.edu/~blynn/gitmagic/ch05.htm...
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Re:Why I Switched to Git From Mercurial by Xurinos on Monday May 17, 2010 @12:41PM (#1354751)
"git rebase" on its own does not permanently alter history. It creates a new branch that looks like a new history, but you can get back to the original history.

"git gc" will prune the unused old histories for that permanent effect.

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Re:Why I Switched to Git From Mercurial by Vitaly on Monday May 17, 2010 @07:05PM (#1355882)
even "git gc" will not do it for a while. the old history will still be referenced from the reflog for some time (I think default is 30 days)
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