topic Re: insert text between lines in Operating System - Linux

insert text between lines

Piotr Kirklewski — Fri, 21 Jan 2011 01:32:21 GMT

Hi there
I need to know how to insert a text into existing file, just before certain text.
Example:

echo "my text" >> myfile.conf

cat myfile.conf

line 1
line 2

my text

#
# AMAVISD-NEW
#

Regards
Peter

Re: insert text between lines

Steven Schweda — Fri, 21 Jan 2011 04:49:38 GMT

Not a very useful description of what you
wish to do. Should "my text" be added at the
beginning of an existing line? On a new line
of its own? Is "my text" always only one
line of text (a constant or variable), or
might it be the contents of some other file?

What is the "certain text" in this "Example"?
Is it the whole line, or some part of a line?

"sed" can do some useful things. For
example:

dyi # cat text.txt
abc def
ghi jkl
mno pqr
stu vwx

dyi # sed -n -e '1,/hi/p' text.txt
abc def
ghi jkl

dyi # sed -n -e '1,/hi/d' -e p text.txt
mno pqr
stu vwx

man sed

Re: insert text between lines

Piotr Kirklewski — Fri, 21 Jan 2011 06:10:40 GMT

Should "my text" be added at the
beginning of an existing line?

Yes,just before:
#
# AMAVISD-NEW
#

Is "my text" always only one
line of text (a constant or variable), or
might it be the contents of some other file?

It's just one line - constant.

Re: insert text between lines

Goran Koruga — Fri, 21 Jan 2011 06:12:37 GMT

Hello.

You can use 'sed', namely the 'i\' and 'a\' (GNU extensions) commands.

Regards,
Goran