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Full Discussion: Break out of tail -f
Top Forums Shell Programming and Scripting Break out of tail -f Post 302778821 by sai2013 on Monday 11th of March 2013 03:45:18 PM
Old 03-11-2013
Break out of tail -f
Hi,

I have a requirement to monitor a srver log file realtime for a word 'Started'. Once found, I invoke another program tp perform additional processing.

The code below meets my requirement.

Code:
tail -f nohup.out | \
while read line ; do
echo "$line" | grep -i "Started"
if [ $? = 0 ]
then
java AAA.jar $1 $2 >>../AAA/logs/$3
break
fi
done

However, I have another script that has the exact code which greps for 'Shutdown' in the same file 'nohup.out'. This does not capture the word and shutdown does not complete entirely.

Is it because the tail -f command is still open? How can i avoid this?

Thanks.
Last edited by Corona688; 03-11-2013 at 05:09 PM..
 

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LEARN ABOUT OPENDARWIN

nohup

NOHUP(1)						    BSD General Commands Manual 						  NOHUP(1)

NAME

     nohup -- invoke a utility immune to hangups

SYNOPSIS

     nohup [--] utility [arguments]

DESCRIPTION

     The nohup utility invokes utility with its arguments and at this time sets the signal SIGHUP to be ignored.  If the standard output is a ter-
     minal, the standard output is appended to the file nohup.out in the current directory.  If standard error is a terminal, it is directed to
     the same place as the standard output.

     Some shells may provide a builtin nohup command which is similar or identical to this utility.  Consult the builtin(1) manual page.

ENVIRONMENT

     The following variables are utilized by nohup:

     HOME  If the output file nohup.out cannot be created in the current directory, the nohup utility uses the directory named by HOME to create
	   the file.

     PATH  Used to locate the requested utility if the name contains no '/' characters.

DIAGNOSTICS

     The nohup utility exits with one of the following values:

     126     The utility was found, but could not be invoked.

     127     The utility could not be found or an error occurred in nohup.

     Otherwise, the exit status of nohup will be that of utility.

SEE ALSO

     builtin(1), csh(1), signal(3)

STANDARDS

     The nohup utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BUGS

     Two or more instances of nohup can append to the same file, which makes for a confusing output.

BSD
								   July 19, 2001							       BSD
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