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How to append data in file at start of file?

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# 1  
Old 03-12-2013
How to append data in file at start of file?
In unix - how to append data in start of file ?

Please advise.

Thanks
# 2  
Old 03-12-2013
Use an editor.


No kidding - what do you want to achieve in which way?
# 3  
Old 03-12-2013
Add a new line in top of file using awk
Code:
awk 'NR==1 {print "new information"}1' oldfile > newfile

# 4  
Old 03-12-2013
i want to understand bit:- why you wrote 1 after print command in awk
Code:
awk 'NR==1 {print "new information"}1' oldfile > newfile

above command is working well.
i want to understand bit:- why you wrote 1 after print command in awk

below "1" i am asking for :

Code:
"}1'  oldfile > newfile

Last edited by radoulov; 03-12-2013 at 07:16 AM..
# 5  
Old 03-12-2013
NR==1 Search argument (look for line number 1)
{print "new information"} program actions (run this if search argument above is true)
1 Serarch argument (since its 1, it will always be true, and always run next program action)
Since there are no program action after 1, it run the default action, that is print the line.

So 1 prints all line and NR==1 adds text before first line is printed
# 6  
Old 03-12-2013
Or do it inside BEGIN block:
Code:
awk 'BEGIN{ print "Prepend Text" } 1' file

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