tail / grep

[Myles Uyema]

This is likely because most shell utilities buffer stdout. You can see
this behavior with tcpdump as well.  A good thing about tcpdump though,
is that it has the -l switch to go into line-by-line mode, which is
redirection-friendly.

I see no similar option with grep.

On Thu, 16 Nov 2000, Mike Ballon wrote:

> Here's a good one:
> 
> tail -f /var/log/squid/access.log | grep -f /etc/Sex.txt > /tmp/busted.txt
> 
> The tail part of the command runs, the grep runs (-f read from file) but I can
> not get it to output to the /tmp/bustex.txt file to save my life and I can't
> figure out why.  Without using the redirection at the end the results of the
> grep are displayed on the crt no problem.
> 
> What I'm thinking is that the grep -f puts the command in a loop and it never
> gets to the > redirect portion, you think?
> 
> 
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