Rename all Files in a UNIX Directory from one date format to another date format

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# 1  
Old 10-25-2013
Question Rename all Files in a UNIX Directory from one date format to another date format

Hi Unix Gurus,

I would like to rename several files in a Unix Directory . The filenames can have more than 1 underscore ( _ ) and the last underscore is always followed by a date in the format mmddyyyy. The Extension of the files can be .txt or .pdf or .xls etc and is case insensitive ie .Xls or .XLS is also possible. Now i need to convert such a file to date format which ends with yyyymmdd.

For eg E-SSS_Reporting_for_Small_Groups_10012013.xls needs to be renamed as E-SSS_Reporting_for_Small_Groups_20131001.xls

How can i accomplish this?

Appreciate your Help on this.
# 2  
Old 10-25-2013
shell script

for FILE in $(ls $DIR)
 OLD_DT=$(echo ${FILE##*_} | cut -d. -f 1)
 NEW_DT=$(expr substr $OLD_DT 5 4)$(expr substr $OLD_DT 1 4)
 RENAMED_FILE=$(echo ${FILE%_*})"_"${NEW_DT}"."$(echo ${FILE##*.})

Replace the red marked /your/directory with the directory name where you have the files.

After reviewing the output you may remove the red echo and execute for renaming files.
This User Gave Thanks to krishmaths For This Post:
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