can add a text line to text files?
 

can add a text line to text files?

As an example, I have learned the under-mentioned code.

But this caused only one line as the above-mentioned ceode at the file.
So, I should edit ever text files.

Is it possible to add a text line to a text file?
And one more, also is it possible to add a text line to some line of a text file?

The double >> means "append at the end of the file", so that the original content of the file is preserved.
Not sure about your last question, but maybe it is a task for sed. Please, do an example of what do you want to achieve (input and desired output are welcome).

You want to use >> to append text to a file, i.e.
echo "/opt/lampp/lampp.start" >> /etc/rc.d/rc.local

This will append the text "/opt/lampp/lampp.start" to /etc/rc.d/rc.local. It will be on a new line if the last character in the file was a newline character (before the append, obviously).

try this:

use ">>" to append the new line to the existing text file. If you want to append this in a new line of rc.local then you should do this
Hope it helps

colucix, Nylex, Matz/ Many thanks for your kind replies.

These two codes works fine!