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Full Discussion: Truncating file based on date
Top Forums UNIX for Dummies Questions & Answers Truncating file based on date Post 302478346 by methyl on Tuesday 7th of December 2010 06:03:28 PM
Old 12-07-2010
Create a cron which runs daily at midnight and rotates the logs.
Note to "Parm0073" (as explained by "achenle") we never issue "mv logfile" (or "rm logfile") because this will create ghost files if the log is open by a process.

This is the longhand method. It should work whether or not the logfile exists each day and will correctly deal with a logfile which is open by a process.
If you currently have a large logfile, the issue will take 8 days to roll off that logfile. Be patient.
Code:
if [ -f logfile-7 ]
then
    rm logfile-7
fi
if [ -f logfile-6 ]
then
    mv logfile-6 logfile-7
fi
if [ -f logfile-5 ]
then
    mv logfile-5 logfile-6
fi
if [ -f logfile-4 ]
then
    mv logfile-4 logfile-5
fi
if [ -f logfile-3 ]
then
    mv logfile-3 logfile-4
fi
if [ -f logfile-2 ]
then
    mv logfile-2 logfile-3
fi
if [ -f logfile-1 ]
then
    mv logfile-1 logfile-2
fi
cp -p logfile logfile-1
>logfile


Just for interest. Personally I rotate system logs at midday. Though you get two half-days in each log it gives you chance to read what happened after you went home at some time before lunch the next day.
Last edited by methyl; 12-07-2010 at 07:17 PM.. Reason: Assorsted corrections and acknowledgements.
 

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LEARN ABOUT MOJAVE

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 1.44.1					    March 2018								LOGSAVE(8)
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