Shell Programming and Scripting

Hi

I need to add a line to several files. But this line can only be added if it has an 'a' or 'A' in its current first line and only for the first line of each file.

I tried sed, but i cant figure how to make it change just the first line. It just changes me all lines with an a. Can you give me a hand plz?

By the way, is there a way to change a file without having to make a copy of it with the changes?

Thanks in advance,

Best regards,

Carlos

You can do something like this.

Code:

#! /bin/sh

for file in *
do
sed -e '1,1!d' -e'/[a|A]/r FILE' $file > $file.out
mv $file.out $file
done

Not tested tho'.

And FILE is the file which will be read after a or A is found.

Vino

I see that a similiar question was posted before.

Before you post, please use our search facility to look for similiar problems/postings.

Check this out

https://www.unix.com/shell-programming-and-scripting/15927-sed-add-new-line-after-finding-text.html

Vino