Re: How to know whether user terminates system("$cmd|more") with q or not?

Simply check the return value from system().

$ perl -e 'print system("some thing|more")."\n"'
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prints 0 on this 'ere system if I quit 'more' by hitting q, 2 if I quit by hitting control-C, 35072 if I kill-9 the 'more' process, and 36608 if I kill -15. The exact values returned may differ slightly from one implementation of 'more' to another, but you're probably safe if you assume that 0 means the user hit q and non-zero means that 'more' terminated for some other reason - just don't try to portably determine what that other reason was!

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Re^2: How to know whether user terminates system("$cmd\|more") with q or not? by BrowserUk (Patriarch) on Sep 14, 2011 at 09:40 UTC
0 means the user hit q and non-zero means that 'more' terminated for some other reason What value do you get if the user allows more to terminate on eof? Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]

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Re^2: How to know whether user terminates system("$cmd|more") with q or not?
by BrowserUk (Patriarch) on Sep 14, 2011 at 09:40 UTC

0 means the user hit q and non-zero means that 'more' terminated for some other reason

What value do you get if the user allows more to terminate on eof?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

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