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Tar archives monthly

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Top Forums Shell Programming and Scripting Tar archives monthly
# 1  
Old 07-12-2015
Tar archives monthly
Hi,

I want to archive files by month,
is there anyway of this code looks better?

Code:
find /tmp/w/ -type f   -newermt '2014-01-01' ! -newermt '2014-02-01' | xargs tar -czvf files01.tar 
find /tmp/w/ -type f   -newermt '2014-02-01' ! -newermt '2014-03-01' | xargs tar -czvf files02.tar 
find /tmp/w/ -type f   -newermt '2014-03-01' ! -newermt '2014-04-01' | xargs tar -czvf files03.tar

Moderator's Comments:
Mod Comment Please use CODE tags (not ICODE tags) for multiline code samples.
Last edited by Don Cragun; 07-12-2015 at 04:37 PM.. Reason: Change ICODE tags to CODE tags.
# 2  
Old 07-12-2015
There are a couple of strange things with the command line:
Code:
find /tmp/w/ -type f   -newermt '2014-03-01' ! -newermt '2014-04-01' | xargs tar -czvf files03.tar

  1. By convention, a gzipped file should have .gz as its final suffix; not .tar.
  2. The reason for using xargs command (or find ... -exec command +) is to run the given command as many times as are needed to meet ARG_MAX limitations. But, if you invoke tar multiple times with the -c option, your output file will be recreated from scratch on each invocation (wiping out the data stored in the previous invocation). You could get around that problem if you remove your output file before you start and use tar -r instead of tar -c, but on many systems you can't use the -z option with -r.
If you use pax instead of tar to create the archive, you can feed it the names of files to be processed through its standard input instead of worrying about command line argument length limits. So you might want to try something more like:
Code:
find /tmp/w/ -type f -newermt '2014-03-01' ! -newermt '2014-04-01' | pax -w | gzip > files03.tar.gz

This User Gave Thanks to Don Cragun For This Post:
rbatte1
# 3  
Old 07-12-2015
Code:
find /tmp/w/ -type f -newermt '2014-01-01' ! -newermt '2014-02-01' -print0 | tar czvf file01.tar.gz --null -T -

Last edited by Aia; 07-12-2015 at 10:06 PM..
# 4  
Old 07-13-2015
thanks for yours input , i will take that into consideration, but about the main question,
how can i make this code in better way , so i do not have to right it multiple times?
i try to do it with for cycles but as i have -newermt 2 times in same iteration it makes it harder
Code:
find /tmp/w/ -type f -newermt '2014-01-01' ! -newermt '2014-02-01' | pax -w | gzip > files01.tar.gz
find /tmp/w/ -type f -newermt '2014-02-01' ! -newermt '2014-03-01' | pax -w | gzip > files02.tar.gz
find /tmp/w/ -type f -newermt '2014-03-01' ! -newermt '2014-04-01' | pax -w | gzip > files03.tar.gz

# 5  
Old 07-13-2015
Code:
year=$(date +%Y)
for month in 01 02 03
do
 if [ $month -ne 12 ]
 then
  endm=$(printf "%02d" $((month+1)))
  endy=$year
 else
  endm=01
  endy=$((year+1))
 fi
 find /tmp/w/ -type f -newermt "$year-$month-01" ! -newermt "$endy-$endm-01" | pax -w | gzip > "files$month.tar.gz"
done

Last edited by MadeInGermany; 07-13-2015 at 08:32 AM.. Reason: removed unnecessary formatting for year
# 6  
Old 07-13-2015
thanks for u answers, but i just wonder how can i save file01.tar.gz in the folder where it find archives and not on local folder ?

coz this function save archive on directory where i run the script
Code:
find /tmp/w/ -type f -newermt '2014-01-01' ! -newermt '2014-02-01' -print0 | tar czvf file01.tar.gz --null -T -

# 7  
Old 07-13-2015
Simply give your output file a full path:-
Code:
find /tmp/w/ -type f -newermt '2014-01-01' ! -newermt '2014-02-01' -print0 | tar czvf /full/path/to/file01.tar.gz --null -T -


Is this what you need?


Robin
Last edited by rbatte1; 07-13-2015 at 11:13 AM.. Reason: Spelling correction
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