Logfile monitoring with logfile replacement Post: 302925247

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Top Forums Shell Programming and Scripting Logfile monitoring with logfile replacement Post 302925247 by Aia on Saturday 15th of November 2014 12:42:02 AM

11-15-2014

Registered User

@Warluck

If you don't see any one posting comments on you thread is a pretty good indication that the inquire is not clear. You might need to give more information or formulate you query differently.

As it happens, I am not quite sure what you mean.

Code:

tail -fn0 $logfile | \
while read line ; do
... some stuff
done

$logfile will keep logging until you stop the mechanism that records the log entries, and this is independent of displaying its content with tail and piping it to a while read loop. It is also independent of that loop.

Thus, this statement of yours is not clear:

Quote:

I would like to end the script right away and not wait a new line to be added to the monitored logfile.

Even if the script stops the mechanism that logs will keep going.

Now, if you want to stop the script right when it encounters a given string, you must read it first, identify it as a show stopper, and exist the script. Therefore, it must be done, before any of the other do ...some stuff.

But, please, expand further, since I'm quite sure this will not satisfy your query.

Last edited by Aia; 11-15-2014 at 02:12 AM.. Reason: Grammar correction

Aia

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LEARN ABOUT CENTOS

logsave

LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME

       logsave - save the output of a command in a logfile

SYNOPSIS

       logsave [ -asv ] logfile cmd_prog [ ... ]

DESCRIPTION

       The  logsave  program  will  execute  cmd_prog with the specified argument(s), and save a copy of its output to logfile.  If the containing
       directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out.	A copy of the output  will
       also be written to standard output.

       If  cmd_prog  is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in
       logfile

       logsave is useful for saving the output of initial boot scripts until the /var partition is mounted,  so  the  output  can  be  written	to
       /var/log.

OPTIONS

       -a     This option will cause the output to be appended to logfile, instead of replacing its current contents.

       -s     This  option  will  cause  logsave  to  skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of
	      Header) and control-B (ASCII 002 or Start of Text).  This allows progress bar information to be visible to the user on the  console,
	      while not being written to the log file.

       -v     This option will make logsave to be more verbose in its output to the user.

AUTHOR

       Theodore Ts'o (tytso@mit.edu)

SEE ALSO

       fsck(8)

E2fsprogs version 1.42.9					   December 2013							LOGSAVE(8)

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