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

[林自均]

Hi Chet,

I was doing the experiment on my macOS, and the bash version is 3.2.57. After that, I tried again with my Ubuntu, which has bash 4.4.19, can't reproduce that. Maybe it's because of the bash version?

Best,

John Lin

Chet Ramey <address@hidden> 於 2019年1月31日 週四 下午10:54寫道：

On 1/30/19 10:34 PM, 林自均 wrote:
> Hi Chet,
>
> Sorry. I realized that I didn't understand what "revert-all-at-newline" is
> doing. I checked the manual, it says:
>
>        revert-all-at-newline (Off)
>               If set to On, readline will undo all changes to history lines
>               before returning when accept-line is executed.  By default,
>               history lines may be modified and retain individual undo lists
>               across calls to readline.
>
> According to the description, I set it to "On" and tried the following
> steps in bash:
>
> 1. Type "echo 5566" and hit "enter"
> 2. Hit "up" to navigate to the history "echo 5566"
> 3. Change it to "echo 7788" and DON'T hit "enter"
> 4. Hit "down" to navigate to an empty place
> 5. Type "ls" and hit "enter"
> 6. Type "history | tail -n 3" and hit "enter"
>
> After that, I expected that I can see the history "echo 5566" in the last
> command since it should be reverted. However, I still see "echo 7788" in
> the results:
>
>     $ history | tail -n 3
>       501* echo 7788
>       502  ls
>       503  history | tail -n 3
>
> What did I miss? Thank you.

It's hard to say. When I try this, I get 'echo 5566' as expected. I suspect
something about how you set revert-all-at-newline, since the `echo 7788'
line has a `*' preceding it, indicating that it's still got an active undo
list.

--
``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/