Re: A quick question about scripting

[Matthew Clarke <clamat_(_at_)_telus_(_dot_)_net>]

jeudi, le 2 septembre, 2004, Greg Wooledge nous a dit ceci:

> Tomas (wisher_(_at_)_myliu_(_dot_)_m-1_(_dot_)_lt) wrote:
> 
> > sendmail -bd && cd /var/log/ && gunzip maillog.6.gz && more maillog.6 |
> mail
> > -s Test my_(_at_)_mail \
> 
> Han already gave you a working example, but here's why yours failed.
> 
> This command:
> 
>    more maillog.6 | mail -s Test my_(_at_)_mail
> 
> cannot work properly in a non-interactive script.  more(1) displays a
> file a page at a time, pausing for user input at the end of each page.
> Since your script is not interactive, it'll never get user input, so
> it'll never go on to the second page.
> 
> If you had used cat(1) instead, then it might have worked, although
> it's not the most efficient way of going about it.

Actually, more(1) and less(1) detect whether their stdout is a tty, and,
if not, they simply dump their output without pausing for user input.

-- 
For a successful technology, reality must take precedence over public
relations, for nature cannot be fooled.
				-- Richard P. Feynman