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Full Discussion: Facing issues with tar and gzip !
Top Forums Shell Programming and Scripting Facing issues with tar and gzip ! Post 302668795 by acidburn_007 on Tuesday 10th of July 2012 03:38:20 AM
Old 07-10-2012
Hi Zedex,

Thanks for the post !

I tried using :-


Code:
 
tar -tvf <tar_file>


After executing it. All the list of the backup log files were displayed. The size of the file doesn't got reduced. Like before it is again doing the tar and gzip operation on the already done files and because of that the size of the backup file is increasing !!!

---------- Post updated at 01:08 PM ---------- Previous update was at 12:39 PM ----------

Hi,
Please let me explain my requirement and the bottleneck!
My Requirement:-
In our main file BLUESTAR_Archieve.log the logs gets appended every day.
So, we are required to take the back-up of the log files daily based on timestamp.
For this I have written a script :-
Code:
 
#!/bin/ksh
# A shell script ------------------------------------------------------------------
cd /app/local/XXX/XXX/XXX/logs
 
find BLUESTAR_Archieve.log -exec cp {} BLUESTAR_Archieve.log _$(date +%y_%m_%d_%H_%M) \;
 
tar –cvf BLUESTAR_Archieve.log _$(date +%y_%m_%d_%H_%M).tar /app/local/XXX/XXX/XXX/logs
 
gzip /app/local/XXX/XXX/XXX/logs/ BLUESTAR_Archieve.log _$(date +%y_%m_%d_%H_%M) 
 
mv BLUESTAR_Archieve.log _$(date +%y_%m_%d_%H_%M) .tar.gz /app/local/XXX/XXX/XXX/logs /LogsBackup
 
rm –f /app/local/XXX/XXX/XXX/logs / BLUESTAR_Archieve.log _$(date +%y_%m_%d_%H_%M)
 
cat /dev/null > BLUESTAR_Archieve.log

Problem :-
The script is running fine.
But when I checked the back-up log files. The size of the files are increasing :-
HTML Code:
-rw-r--r-- 1734571 Jul 9 10:03 BLUESTAR_Archive.log.log_12_07_10_10_03.tar.gz
-rw-r--r-- 3318456 Jul 9 10:10 BLUESTAR_Archive.log.log_12_07_10_10_10.tar.gz
-rw-r--r-- 12031131 Jul 9 10:15 BLUESTAR_Archive.log.log_12_07_10_10_15.tar.gz
-rw-r--r-- 41523045 Jul 9 10:26 BLUESTAR_Archive.log.log_12_07_10_10_26.tar.gz
-rw-r--r-- 66620915 Jul 9 10:38 BLUESTAR_Archive.log.log_12_07_10_10_38.tar.gz

After getting the post from fellow members. I came to realize that the tar and gzip are performing the action on the files on which this action had already been performed.
I tried the below command also :-
Code:
Tar –tvf <tar_file >



But this is displaying all the files in the BackupLogs !!!

Is there any way around. So, that the tar and gzip don’t perform the same operations on the already performed files.
I don't need the tar and gzip to perform the same action on the already done files. Instead it should be doing the tar and gzip action only on new files !
Please suggest/ help !

Thanks
Last edited by acidburn_007; 07-10-2012 at 04:43 AM..
 

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