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Old 06-10-2006, 06:34 AM   #16
Registered: Aug 2004
Distribution: Suse
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Emailing output of tail -f

How would I be able to do something like this:

tail -f log | grep "I'm finished" | mail -s "It Is Finished"

What I want is as soon as tail -f detects the string "I'm finished", to email the output of the "grepped" string (not the entire log) and return me to a command-prompt.

Is that doable?
Old 06-12-2006, 01:28 AM   #17
Registered: Mar 2006
Distribution: FC4
Posts: 184

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check out this thread
Old 06-12-2006, 04:46 AM   #18
spirit receiver
Registered: May 2006
Location: Frankfurt, Germany
Distribution: SUSE 10.2
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You could use process substitution:
#! /bin/bash

while read
	mail -s "New line in logfile" dude <<- EOF
	Hi Dude,
	a new line was appended to your logfile. Here it is:
done < <( tail -f logfile )
Note that this will spawn an extra process for the tail command, which will still be running if the script itself is finished.
Old 10-14-2006, 04:07 PM   #19
Registered: Sep 2004
Posts: 128

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hi i'm trying to do a tail of the processes under my system. I can't seem to get it to work. I have tried doing tail this way

tail -f|ps aux

The processes display but it is static it's not updating the processes. I'm doing this just to understand the tail and Pipe commands, I might want to try redirecting the output to a text file too just for fun. Any thoughts guys? Thanks
Old 10-16-2006, 02:19 AM   #20
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Registered: Nov 2005
Location: Belgium
Distribution: Red Hat, Fedora
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i'm trying to do a tail of the processes under my system.
What do you mean by this? Do you want to run tail on the output of some of your processes? Or do you want
tail to filter the output of your "ps" command, that gives you a list of processes?

Assuming you mean the latter:
ps -aux just lists some running processes once, not continuously, so you don't need tail's -f option.
Also, I think you have the order of the commands reversed:
ps -aux | tail
displays only the last few lines of ps's output. You can control how many lines you want by adding "-n" (replace n with the number you want) to "tail".

And finally, try to start a new thread when you have a question, rather than hijacking someone else's, which is against the forum policy.

Last edited by timmeke; 10-16-2006 at 02:20 AM.


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