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Old 12-29-2005, 03:15 PM   #1
1veedo
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Registered: Dec 2004
Location: WV, USA
Distribution: Gentoo, Debian
Posts: 186

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How to keep reading a file (quick question)


I know there's a way because I've done it before in log files and sent the output here for debuging

If a file keeps getting additions to it (append?) how do you read the additiosn to the file? Like say you have program > file to log what it does but you also want to see what it's doing.


Another question: When you use > or >> it sends everything but errors / warnings. How do you send even the errors to the file?

What I'm wanting to do is log my bzfs server but I also want to see normal output from it. bzfs ..... > logfile. grep | cat-nsf logfile...

Last edited by 1veedo; 12-29-2005 at 03:17 PM.
 
Old 12-29-2005, 03:35 PM   #2
MidnightCmdr
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Registered: Oct 2004
Location: Austin TX
Distribution: Debian
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Let me tell you about a command called 'tail'. Let's say you want to continuously view the output of /var/log/syslog (somthing I do a LOT):

tail -f /var/log/syslog

and kill it with CTRL-C. That's all there is to that.

2nd question:
What you're seeing here is the separation between STDOUT & STDERR (the standard output & standard error streams). Here's the portable (shell agnostic) way of grabbing them both:

command > file_to_write.log 2>&1

and here's the Bash-specific way (which I prefer):

command &> file_to_write.log
 
Old 12-29-2005, 04:56 PM   #3
1veedo
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Cool, thanks.
 
  


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