log rotate script for linux

[Adithyan]

Hello all,

Need some help in writing a custom script to rotate my /var/log/messages files in my Linux server.

Instead of the syslog rotating my /var/log/messages weekly, I would like to rotate the file in a daily basis and save file like day1, day2... in my /var/log directory.

My /var/log directory would look like /var/log/day1 /var/log/day2 instead of /var/log/messages /var/log/messages.1

Please let me know how to establish this?

Thanks in advance
Adithyan

[Alexander Chuzhoy · Accepted solution]

First, set the respective line in /etc/syslog.conf to point to /var/log/day1 instead of to /var/log/messages;
then copy the following to the file,make it executable and schedule it to run on a daily basis (assuming you want to have only 5 copies):
#!/bin/bash
maxdays=5;rm -f day${maxdays} ; for i in `seq 1 ${maxdays}`; do num=`expr ${i} - ${maxdays}`;num=`expr ${num} \* -1`;echo "$num";newnum=`expr ${num} + 1`; if [ -f day${num} ]; then mv day${num} day${newnum};fi; done ; touch day1

And most important - don't forget to assign points.

[alang]

Here is my script that is used for rotating the listener log of Oracle.

Put it into crontab so that be executed at the fixed period.

===============================================
#!/usr/bin/bash

# lsnrlog-rotate.sh - Automatical rotate the listener.log
# History:
# 2008/2/12(alang)
#
. $HOME/.profile

LOGDIR="$ORACLE_HOME/network/log/"
LOGNAME="listener.log"
LSNR_CTL="$ORACLE_HOME/bin/lsnrctl"
DURATION=3

BK_LOG1="${LOGNAME}.1"
BK_LOG2="${LOGNAME}.2"
BK_LOG3="${LOGNAME}.3"
BK_LOG4="${LOGNAME}.4"

echo "**** $(date +'%y/%m/%d@%H:%M') ****"

if [ ! -w $LOGDIR -o ! -x $LOGDIR ]; then
echo "$0: you don't have the appropriate permission in $LOGDIR" >&2
exit 1
fi

cd $LOGDIR
if [ -f "$BK_LOG1" ];then
if [ -z $(find "$BK_LOG1" -mtime +$DURATION -print 2> /dev/null) ]
then
echo "$LOGNAME's most recent backup is more recent then $DURATION days: exiting"
exit 0
fi
fi
echo "Rotating log $LOGNAME (using a $DURATION day schedule)"

if [ -f "$BK_LOG3" ]; then
echo "... $BK_LOG3 -> $BK_LOG4"; mv -f "$BK_LOG3" "$BK_LOG4"
fi

if [ -f "$BK_LOG2" ]; then
echo "... $BK_LOG2 -> $BK_LOG3"; mv -f "$BK_LOG2" "$BK_LOG3"
fi

if [ -f "$BK_LOG1" ]; then
echo "... $BK_LOG1 -> $BK_LOG2"; mv -f "$BK_LOG1" "$BK_LOG2"
fi

if [ -f "$LOGNAME" ]; then
$LSNR_CTL set log_status off
cp -f "$LOGNAME" "$BK_LOG1"
cat /dev/null > "$LOGNAME"
$LSNR_CTL set log_status on
echo "... $LOGNAME -> $BK_LOG1"
fi

#EOF