Shell Programming and Scripting

I am new to unix scripting. we are using bash. My task is I have dir which contains 30 files.

The first column in each file is Date field. For all the files I need to extract
the date part Ex(2007-09-05) from the file and add that at the end of that file.

for example:

The file names are like test.txt,test1.txt,test2.txt

it need to be changed as test_2007-09-05.txt etc.

test.txt

Date Source Location Point count
2007-09-05 15:31:46 Phone Dallas 100 864
2007-09-05 15:31:46 Email Dallas 1000 514



test1.txt
Date Source Location Point count
2007-09-05 15:31:46 Phone Atlanta 100 864
2007-09-05 15:31:46 Email Atlanta 1000 514



test2.txt

Date Source Location Point count
2007-09-05 15:31:46 Phone Arizona 100 864
2007-09-05 15:31:46 Email Arizona 1000 514



Can you please paste any sample script.

Thanks for help,

mag

With GNU grep:

Code:

for f in *.txt;do 
	mv "$f" "${f%.txt}_$(egrep -om1 '^[0-9]{4}-[0-9]{2}-[0-9]{2}' "$f").txt"
done

Without GNU grep:

Code:

for f in *.txt;do 
	mv "$f" "${f%.txt}_$({ read< <(egrep '^[0-9]{4}-[0-9]{2}-[0-9]{2}' "$f");echo ${REPLY%% *};}).txt"
done

Code:

for each in *.txt
do
mv $each ${each}_$(awk -F" " 'NR==2 { print $1}' $each )
done