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Shell script for Date conversion from mm/dd/yy to mm/dd/yyyy

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# 1  
Old 03-30-2011
Shell script for Date conversion from mm/dd/yy to mm/dd/yyyy
Seek help in coverting date from mm_dd_yy to mm_dd_yyyy.
I get a date in a file some thing file like this
09_14_11.pdf
Need to convert the same to
09_14_2011.pdf

Smilie
# 2  
Old 03-30-2011
Code:
$ echo "09_14_11.pdf" | ruby -e 'print gets.sub(/_11/,"_2011")'
09_14_2011.pdf

# 3  
Old 03-30-2011
There are many ways to do that, but what have you tried?
# 4  
Old 03-30-2011
Date changes randomly.. So if you can help in making this generalized command it will help.
09_14_11.pdf
03_04_04.pdf
05_04_07.pdf

I am new to unix and shell scrpt. Your timely help is greatly appreaciated.
# 5  
Old 03-30-2011
Code:
$ echo "09_14_11.pdf" | ruby -e 'print gets.sub(/_(\d+)\./,"_20\\1.")'
09_14_2011.pdf
$ echo "03_04_04.pdf" | ruby -e 'print gets.sub(/_(\d+)\./,"_20\\1.")'
03_04_2004.pdf

# 6  
Old 03-30-2011
Thanks for your quick response.
I am on AIX... It says ksh: ruby: not found

Can you please help
# 7  
Old 03-30-2011
Not sure if you need to deal with 1900 dates too:

Code:
$ echo "12_23_92.pdf
01_01_08.txt
01_10_60.txt" | 
sed -e 's/\([0-9][0-9]\)_\([0-9][0-9]\)_\([3-9][0-9]\)\./\1_\2_19\3./' -e 's/\([0-9][0-9]\)_\([0-9][0-9]\)_\([0-2][0-9]\)\./\1_\2_20\3./'
12_23_1992.pdf
01_01_2008.txt
01_10_1960.txt

Otherwise:
Code:
sed 's/\([0-9][0-9]\)_\([0-9][0-9]\)_\([0-2][0-9]\)\./\1_\2_20\3./'
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