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I want to review changes I made to my file before I save it. Is it possible to do this, preferably without using vimrc or installing additional software? I'm using Neovim on Windows.

I tried one of the answers here:

https://stackoverflow.com/questions/749297/can-i-see-changes-before-i-save-my-file-in-vim

Which was:

:w !diff % -

This is what I get:

'diff' is not recognized as an internal or external command,
operable program or batch file.

shell returned 1

I also tried putting the command through bash using Windows Subsystem for Linux:

:w !bash -c 'diff % -'

The result:

diff: -: Illegal seek

shell returned 2

I tried both Windows Command Line and Windows PowerShell and both of the above give the same results. I see there are other answers that include editing vimrc or installing other software, but I wanted to see if there was a simple way to do it first.

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I haven't figured out the reason for the error, but I did find a simple workaround:

:w !bash -c "cat - | diff % -"

Looks like diff is trying to do a seek that isn't supported by the stream. So buffering it through cat seems to solve the problem.

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