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How to change date in a filename?

 
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# 1  
Old 04-12-2012
How to change date in a filename?
Hi

i want to list files based on date and change the date alone in the files in a directory
Code:
abc20120101.txt
xyzxyxz20120101.txt
ccc20120201.txt
ddd20120301.txt

In the above i want to select only files having date 20120101 and rename the date for those files like below
Code:
abc20111231.txt
xyzxyxz20111231.txt

How to do this?
Last edited by Franklin52; 04-13-2012 at 04:58 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 04-12-2012
Code:
for x in *20120101.txt; do mv $x ${x%%2*}20111231.txt; done

# 3  
Old 04-12-2012
Quote:
Originally Posted by balajesuri
Code:
for x in *20120101.txt; do mv $x ${x%%2*}20111231.txt; done


Thanks ..it worked perfectly..BTW why u use {x%%2*}...
# 4  
Old 04-12-2012
It's known as parameter expansion.
 
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