By default the selection-popup is enabled, and can be opened by [Ctrl + Button 3 (Right Mouse Button)]. It has four functions:

1. (0:15) rot13
2. (0:35) eval Perl expression
3. (1:25) to unicode hex index
4. (2:00) shell quote

The result will be echoed on screen and is put back to selection, so you could paste to somewhere. I found that (2) and (4) are the most useful since you could use (2) as quick calculation if your desktop calculator is too far away. (4) might prove useful if you need to quote a text.

This popup extension can be disabled, see urxvt(7).

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* rxvt-unicode 9.18
* GPLv2

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