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bug#27942: Bug regarding "touch" command

From: Paul Eggert
Subject: bug#27942: Bug regarding "touch" command
Date: Fri, 4 Aug 2017 09:17:50 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

L A Walsh wrote:
You run "touch -". Whatever file stdout happens to be associated with, gets touched. It's the same idea as "cat -", except with stdout rather than stdin.

The difference between that and updating due to write activity being
mostly that ctime is also written?

No, that's not a difference. Try running 'touch foo; strace touch foo; strace touch - >>foo'. I did that, and saw the same system call being used to alter foo's last-modified time, in both strace outputs.

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