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Full Discussion: Copy last 30 minutes' contents from a log file
Top Forums UNIX for Beginners Questions & Answers Copy last 30 minutes' contents from a log file Post 303040260 by Chubler_XL on Friday 25th of October 2019 04:22:59 PM
Old 10-25-2019
Assumption is that if a logrotation occurs the resulting file will be smaller that the last run.
This is identified with [ $EndLine -lt $StartLine ] && StartLine=0

On systems I have worked with log files grow at a fairly consistent rate and logrotation only occurs every week.

Not to say it's impossible but and I've never encountered a file that got truncated and then grew bigger than it's previous size within 30mins.
 

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LEARN ABOUT SUSE

nislog

nislog(1M)                                                System Administration Commands                                                nislog(1M)

NAME

       nislog - display the contents of the NIS+ transaction log

SYNOPSIS

       /usr/sbin/nislog [-h num | -t num]  [-v] [directory...]

DESCRIPTION

       nislog  displays  the  contents of the NIS+ server transaction log on the standard output. This command can be used to track changes in the
       namespace. The /var/nis/trans.log file contains the transaction log maintained by the NIS+ server. When updates occur, they are  logged  to
       this  file  and  then  propagated  to replicas as log transactions.  When the log is checkpointed, updates that have been propagated to the
       replicas are removed.

       The nislog command can only be run on an NIS+ server by superuser. It displays the log entries for that server only.

       If directory is not specified, the entire log is searched. Otherwise, only those logs entries that correspond to the specified  directories
       are displayed.

OPTIONS

       -h num          Display num transactions from the ``head'' of the log. If the numeric parameter is  0, only the log header is displayed.

       -t num          Display  num transactions from the ``tail'' of the log. If the numeric parameter is  0, only the log header is displayed.

       -v              Verbose mode.

FILES

       /var/nis/trans.log      transaction log

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWnisu                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       nis+(1), rpc.nisd(1M), nisfiles(4), attributes(5)

NOTES

       NIS+  might  not  be  supported in future releases of the SolarisTM Operating Environment. Tools to aid the migration from NIS+ to LDAP are
       available in the Solaris 9 operating environment. For more information, visit http://www.sun.com/directory/nisplus/transition.html.

SunOS 5.10                                                          12 Dec 2001                                                         nislog(1M)
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