I use the commmand line text editor nano. How do I undo an action while editing text?
For example: I typed some text and then changed my mind. Now I want to return to previous state. How?
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Starting with nano version 2.3.5 in July 2014, undo/redo became standard:
It's in the help:
And if you stretch the screen wider than about 1400 pixels, there's a hint at bottom right:
If these keys don't work, check
nano versions 2.1.10 - 2.3.4 should use the command line option
-u (thanks @sil). Tip: add
alias nano="nano -u" to your .bashrc (thanks @Benia). The implementation of undo during this period appears to have been buggy or incomplete.
nano versions 2.1.3 - 2.1.9 had some kind of undo feature. The
-u option was not necessary.
M stands for meta.