topic Re: Inserting a line on top file. in Operating System - Linux

Inserting a line on top file.

Leo The Cat — Thu, 22 Jan 2009 15:06:27 GMT

Hi Guys

How to insert a new line with text at the beginning of a text file ?

Bests Regards
Den

Re: Inserting a line on top file.

James R. Ferguson — Thu, 22 Jan 2009 15:16:25 GMT

Hi Den:

This will perform an "in-place" update:

# perl -pli -e '$.==1 and print "INSERTED"' file

Regards!

...JRF...

Re: Inserting a line on top file.

Shoghi Martinez G. — Thu, 22 Jan 2009 15:20:40 GMT

Assuming that you are talking about scripting,
Maybe something lke this:

file.txt : the file without the the new header file
head.txt : a file with the line to be inserted in top.

mv file.txt file.txt.old
cat head.txt file.txt.old > file.txt

Re: Inserting a line on top file.

Leo The Cat — Thu, 22 Jan 2009 15:21:33 GMT

Thanks James,
That's do the trick !

Bests Regards
Den

Re: Inserting a line on top file.

Fredrik.eriksson — Thu, 22 Jan 2009 15:21:53 GMT

Another, non-perlish, solution would be to just recreate the file.

echo "what-you-want-the-top-line(s)-to-contain" > tmp.file
cat orig.file >> tmp.file
mv tmp.file orig.file

Best regards
Fredrik Eriksson

Re: Inserting a line on top file.

Dennis Handly — Sun, 25 Jan 2009 08:02:24 GMT

You can also use sed:
sed '
1i\
line
' file > file.new