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Re: [Bug-readline] Disable the "modify history with arrow keys" feature

From: Chet Ramey
Subject: Re: [Bug-readline] Disable the "modify history with arrow keys" feature
Date: Mon, 28 Jan 2019 11:02:57 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 1/28/19 2:05 AM, 林自均 wrote:
> Hi,
> When I am using bash, I found that bash has the following behavior:
> 1. Use arrow key to navigate to a history command (e.g., "echo 5566").
> 2. Modify the command (e.g., change to "echo 7788").
> 3. Instead of hitting enter to execute it, use arrow keys to navigate to
> other commands.
> 4. Ctrl+C
> 5. The history is modified (e.g., "echo 5566" is changed to "echo 7788").
> This feature bothers me a lot since I don't expect that I can modify
> history in such obscure method. Especially the fact that step 3 above is
> necessary to modify the history makes me feel so weird.

This is pretty well baked in to how readline operates. While the history
entry is modified, it has an individual entry-specific undo list, and all
changes are reverted if you hit return (you can also run the undo list on
demand). If you want every line with an undo list to be reverted whenever
readline returns, set the variable `revert-all-at-newline'.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/

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