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Full Discussion: awk logic for tailing and printing
Top Forums Shell Programming and Scripting awk logic for tailing and printing Post 302876414 by Akshay Hegde on Sunday 24th of November 2013 10:33:42 AM
Old 11-24-2013
Quote:
Originally Posted by SkySmart
suppose i'm tailing the /var/log/syslog file, i tried the above and it doesn't appear to work.
Code:
tail -500 | awk '/FAILED/{end=NR;start=NR-200;next}FNR>=start && FNR<=end{print}'

i left out the the "file file" in your example because that wont be necessary. what I want to do is output the 200 lines if and only if the last line of the file contains an entry and the entry contain "FAILED". some times the last line of a file or output can be blank. so i also need to account for that.

btw, the "tail -500" in my example is just a good example that explains the type of manner if which the data i'm working on is given to me. so basically, i would have to run the awk command on the output produced by a process.
Please provide input. you can use attachment option.
 

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LEARN ABOUT DEBIAN

qmail-start

qmail-start(8)						      System Manager's Manual						    qmail-start(8)

NAME

       qmail-start - turn on mail delivery

SYNOPSIS

       qmail-start [ defaultdelivery [ logger arg ...  ] ]

DESCRIPTION

       qmail-start  invokes qmail-send, qmail-lspawn, qmail-rspawn, and qmail-clean, under the proper uids and gids.  These four daemons cooperate
       to deliver messages from the queue.

       qmail-start arranges for qmail-send's activity record to be sent to qmail-start's output.  See qmail-log(5) for the format of the  activity
       record.	Other than this, qmail-start does not print anything, even on failure.

       If defaultdelivery is supplied, qmail-start passes it to qmail-lspawn.

       If logger is supplied, qmail-start invokes logger with the given arguments, and feeds qmail-send's activity record through logger.

       Environment variables given to qmail-start will eventually be passed on to qmail-local, so make sure to clean up the environment if you run
       qmail-start manually:

	  # env - PATH="/var/lib/qmail/bin:$PATH"
	  qmail-start ./Mailbox splogger qmail &
	  (all on one line)

       Resource limits, controlling ttys, et al. are also passed from qmail-start to qmail-local.

       Note that qmail-send normally juggles several simultaneous deliveries.  To reduce qmail-send's impact on other programs, you can run qmail-
       start with a low priority.

SEE ALSO

       logger(1), splogger(1), nice(1), qmail-log(5), qmail-local(8), qmail-clean(8), qmail-lspawn(8), qmail-rspawn(8), qmail-send(8)

																    qmail-start(8)
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