DISCLAIMER : Please note that blog owner takes no responsibility of any kind for any type of data loss or damage by trying any of the command/method mentioned in this blog. You may use the commands/method/scripts on your own responsibility.If you find something useful, a comment would be appreciated to let other viewers also know that the solution/method work(ed) for you.


Rotating Log Files

This script moves on log files listed on the command line. It keeps all but the most recent one
compressed, and removes the last one once there are more than CYCLES of them. For example,
CYCLES=3 ; rotate messages Would have the following effects.

messages --> messages.1
messages.1 --> messages.2.gz
messages.2.gz --> messages.3.gz
messages.3.gz --> removed

script :


#!/bin/sh
# Rotate a log file and keep N copies
# Mostly stolen from inn
CYCLES=${CYCLES-5}
COMPRESS=/usr/local/bin/gzip
Z=.gz
for F in $* ; do
## Compress yesterday’s .1
test -f ${F}.1 \
&& ${COMPRESS} <${F}.1 >${F}.1${Z} \
&& rm -f ${F}.1 \
&& chmod 0440 ${F}.1${Z}
## Do rotation.
EXT=${CYCLES}
rm -f ${F}.${CYCLES}${Z}
while [ ${EXT} -gt 0 ] ; do
NEXT=${EXT}
EXT=‘expr ${EXT} - 1‘
test -f ${F].${EXT}${Z} \
&& rm -f ${F}.${NEXT}${Z} \
&& mv ${F}.${EXT}${Z} ${F}.${NEXT}${Z}
done
mv ${F} ${F}.1
done


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