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how to add current date to the file with sed

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# 1  
Old 03-17-2010
how to add current date to the file with sed
I want to add current date into the begin of the first line of the file.
please show me the way please with "date" commond and sed
# 2  
Old 03-17-2010
Try this,

Code:
dat=`date "+%D" `
sed -ri "1s#(.*)#${dat}\1#" input_file

# 3  
Old 03-17-2010
With awk:

Code:
awk 'BEGIN{system("date +%D")}1' file

# 4  
Old 03-17-2010
Code:
sed -i "1s|^|$(date +%D) |" infile

# 5  
Old 03-17-2010
I get illegal option with -i but it works well without it.

What is -i and what version does it apply to?
Its ok I just saw the earlier post
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