1

If I run

$ ulimit -t 5
$ yes

then yes gets killed after 5 seconds, but man and less/more don't.

Why are those two immune to ulimit?

2

My guess is that it's because you are limiting CPU time and these apps spend most of their time waiting on input so they don't use much CPU. Try more-ing a largish file and holding down space until ps shows you have used 5 seconds of CPU.

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