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Full Discussion: setting max log file size...
Top Forums Shell Programming and Scripting setting max log file size... Post 18601 by Jimbo on Sunday 31st of March 2002 12:26:07 PM
Old 03-31-2002
It would be nice if unix supported circular files. On old HP3000, I could build a file of desired size, specify cir attribute, and output to the file would be circular.

The following downsizes log.txt back to 800 lines after it hits 1200 lines, but you could use "wc -c" to control on number of characters instead. I use tail +nnn logic because tail -nnn will go back only so far.

Of course, do this when the file is not in use.
Code:
#!/bin/sh

wc -l log.txt | read lcnt other

if [ $lcnt -gt 1200 ] ; then
   ((start=$lcnt-799))
   echo 'downsizing ...'
   tail +$start log.txt > log.txtN
   mv log.txtN log.txt
fi

exit 0

Jimbo
 

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LEARN ABOUT SUSE

tailf

TAILF(1)						     Linux Programmer's Manual							  TAILF(1)

NAME

       tailf - follow the growth of a log file

SYNOPSIS

       tailf [OPTION] file

DESCRIPTION

       tailf will print out the last 10 lines of a file and then wait for the file to grow.  It is similar to tail -f but does not access the file
       when it is not growing.	This has the side effect of not updating the access time for the file, so a filesystem flush does not occur  peri-
       odically when no log activity is happening.

       tailf is extremely useful for monitoring log files on a laptop when logging is infrequent and the user desires that the hard disk spin down
       to conserve battery life.

       Mandatory arguments to long options are mandatory for short options too.

       -n, --lines=N, -N
	      output the last N lines, instead of the last 10.

AUTHOR

       This program was originally written by Rik Faith (faith@acm.org) and may be freely distributed under the  terms	of  the  X11/MIT  License.
       There is ABSOLUTELY NO WARRANTY for this program.

       The latest inotify based implementation was written by Karel Zak (kzak@redhat.com).

SEE ALSO

       tail(1), less(1)

AVAILABILITY

       The tailf command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

								 13 February 2003							  TAILF(1)
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