this post was submitted on 26 Oct 2023
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Emacs's
undo-tree-- which I mentioned above that I use -- also provides non-destructive undo, same as emacs's base undo. So you can't lose data by undoing things. However, it also uses theundoandredosemantics to traverse one branch of the tree, so it works like most other apps as long as you aren't needing to recover data that would normally have been "lost" by performing an undo.There are probably faster ways to do it, but since I rarely need to quickly grab stuff that an undo destroyed, I haven't looked into them.
Do non-undo operation.
Undo it.
Do non-undo operation. At this point, in software packages that lack non-destructive undo, you will have lost the data in #1.
Run
undo-tree-visualize, onC-x uby default. A new window will come up displaying the undo history as a tree.You can traverse around the tree. Move to the node immediately before the branch that you abandoned, and use
C-bandC-fto switch between branches.