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Easy Bash scripting question

Posted on 2004-08-31
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Last Modified: 2010-04-21
I'm a programmer, but not familar with Linux scripting.

I have a script that stops MySQL, zips up the database files, and then restarts MySQL.  The tar files are named mysql-YYYYMMDD.tar.gz, but I need to run the process more than once a day.  So that I would end up with.

mysql-YYYYMMDD-001.tar.gz
mysql-YYYYMMDD-002.tar.gz

I'm guessing I'm going to have check to see if file ...001 exists then ...002 in a loop, but I'm having a hard time getting it to work.
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Question by:steve918
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cjjclifford earned 250 total points
ID: 11944003
#!/bin/bash

tar_file_name=$(date +mysql-%Y%m%d)
i=1
while [ -f ${tar_file_name}$i ]; do
    i=$(expr $i + 1)
done

next_full_tarfile=${tar_file_name}-${i}.tar

# where blagh here are the files to be tarred...
tar cf $next_full_tarfile blagh
gzip -9 $next_full_tarfile
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Expert Comment

by:cjjclifford
ID: 11944038
appologies, the 5th line (while...) should read as follows:

while [ -f ${tar_file_name}-${i}.tar ]; do

Cheers,
C.
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LVL 3

Author Comment

by:steve918
ID: 11946232
I had to change the while to include the .gz like so

while [ -f ${tar_file_name}-${i}.tar.gz ]; do

Then everything worked great.  THANKS.
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LVL 11

Expert Comment

by:cjjclifford
ID: 11950187
d'oh, forgot that too... thanks for the points.
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