[SOLVED] Find and replace multiple instances

gdavis2287 · 08-13-2010, 03:49 PM

I have a file with the following in it:

:0 local /usr/X11R6/bin/X -nobanner
:1 local /usr/X11R6/bin/X

I need to add "-nolisten tcp" to both of these lines and cannot figure out how to do it. I can get it to do the first one, but not the 2nd and so on.

How do I search the file and loop though it to change them all?

TIA

druuna · 08-13-2010, 04:04 PM

Hi,

Would this help:

sed 's%\(:[0-9][0-9]* local /usr/X11R6/bin/X.*\)%\1 -nolisten tcp%' infile

Assuming that the 0 and 1 is the only none unique part (and the -nobanner part). The above accounts for this.

Add the -i switch to replace in place.

Hope this helps.

ghostdog74 · 08-13-2010, 09:05 PM

Code:

awk '/^:[01]/{$0=$0" -nolisten tcp"}1' file >temp &&mv -f temp file

Code:

sed -i.bak '/^:[01]/s/$/ -nolisten tcp/' file

Code:

#!/bin/bash
while read -r line
do
  case "$line" in
   ":"[01]* ) line="$line -nolisten tcp"
  esac
  echo "$line"
done <"file" > t
mv t file

if you want to search for other numbers besides 0 and 1, use [0-9]

grail · 08-13-2010, 11:46 PM

Code:

sed -i 's/:[01].*/& -nolisten tcp/' file

konsolebox · 08-14-2010, 12:28 AM

Code:

sed -i '/^:[01] /s/.*/& -nolisten tcp/' file

or more specific:

Code:

sed -i '/^:[01] local \/usr\/X11R6\/bin\/X/s/.*/& -nolisten tcp/' file

in any way you should test it on a different file first

druuna · 08-14-2010, 04:43 AM

@ghostdog74 / grail / konsolebox: Did you miss the and so on part

Your examples only work for 0 and 1 not for any other, higher, numbers.

ghostdog74: replcement part isn't -nobanner but -nolisten tcp

Must have been early (or late, depending)

konsolebox · 08-14-2010, 04:48 AM

@druuna He was not specific on the and so on thing. It could be 1 and so on matches. Not 0 and 1 and so on.

druuna · 08-14-2010, 05:07 AM

@konsolebox: I'm sure s/he was specific:

Quote:

I can get it to do the first one, but not the 2nd and so on.

Translates to: I can do the 0, but not the 1 and 2 and 3 and ........

One thing that isn't clear from the first post: Are there any other lines in that file that should not be changed, but do start with :<number>??

If so then most of the other answers will fail as well.

konsolebox · 08-14-2010, 06:07 AM

Quote:

I can get it to do the first one, but not the 2nd and so on.

@druuna There's only one part of what he said that could refer to more matches from 0 to 1 and 2 and so on but that part still could also refer to just more matches of the two lines that he said. Putting that question aside there are two more statements that can tell that he was just referring to the two lines:

Quote:

Originally Posted by gdavis2287

I have a file with the following in it:

Quote:

Originally Posted by gdavis2287

I need to add "-nolisten tcp" to both of these lines

Referring to those statements which do you think has the higher probability, does he refer to 0..inf or just matches of the two lines?

druuna · 08-14-2010, 06:23 AM

Hi,

@konsolebox: I'm not trying to make assumptions when it comes to questions asked, but most people tend to give small examples instead of full relevant examples, so sometimes you do need to make an assumption.

The fact that the example only holds 2 lines and that the OP talks about "... the first one, but not the 2nd and so on" contradict each other. The only safe assumption I can make at this point is that there are probably more then the 2 lines shown in the file that needs to be changed and that there could also be other, none-relevant, lines present in that file.

For me the higher probability is that the OP posted a small part of the file(s) s/he needs to change and my answer takes that into account.

Lets wait until the OP comes on line again and see what s/he really wanted/needed.

grail · 08-14-2010, 11:16 PM

Well I agree that we can to and fro about this forever. Would the OP please reply and let us out of our misery

I think we need to know:

1. Does the 'and so on' refer to more combinations like ':N' where N is any number?

2. Are there other lines in the file which should not be changed? If so, what do they look like?

If anyone can think of other questions for the OP please add

gdavis2287 · 08-16-2010, 07:48 AM

I should have said this is the Xservers file and that might have helped. In this file you can have any number of lines that start X on any given terminal. What is really boils down to is I want to add "-nolisten tcp" to any line that has /usr/X11R6/bin/X I guess. That should address the "and so on"...:N could be 0, 1, 2, 3, 4...

All lines should be changed that have /usr/X11R6/bin/X in it, so I would prefer to just ignore the :N portion of the file if possible because who knows what :N will be...most of the time there will only be one entry in this file, but we all know it's possible to have more.

I should also add if the line already has "-nolisten tcp" I don't want to append it again

So if the file looks like this below, I only need to add it to the one that does not have it.

:0 local /usr/X11R6/bin/X -nolisten tcp
:1 local /usr/X11R6/bin/X

I'm working on testing the solutions people have put in and will update this later today...

Thanks for all the replies.

gdavis2287 · 08-16-2010, 07:54 AM

Quote:

Originally Posted by druuna

Hi,

Would this help:

sed 's%\(:[0-9][0-9]* local /usr/X11R6/bin/X.*\)%\1 -nolisten tcp%' infile

Assuming that the 0 and 1 is the only none unique part (and the -nobanner part). The above accounts for this.

Add the -i switch to replace in place.

Hope this helps.

If I do this and if the line already has "-nolisten tcp" it adds it again....so this did not seem to work for me.

druuna · 08-16-2010, 08:12 AM

Hi,

This will fix the possible double -nolisten tcp issue:

sed '/-nolisten tcp/!{s%\(:[0-9][0-9]* local /usr/X11R6/bin/X.*\)%\1 -nolisten tcp%}' infile

Example run:

Code:

$ cat infile
:0 local /usr/X11R6/bin/X -nobanner
:1 local /usr/X11R6/bin/X
:10 local /usr/X11R6/bin/X -nolisten tcp
:11 local /usr/X11R6/bin/X -nobanner -nolisten tcp
:100 local /usr/X11R6/bin/X -nolisten tcp -nobanner
:1000 local /usr/X11R6/bin/X

$ sed '/-nolisten tcp/!{s%\(:[0-9][0-9]* local /usr/X11R6/bin/X.*\)%\1 -nolisten tcp%}' infile
:0 local /usr/X11R6/bin/X -nobanner -nolisten tcp
:1 local /usr/X11R6/bin/X -nolisten tcp
:10 local /usr/X11R6/bin/X -nolisten tcp
:11 local /usr/X11R6/bin/X -nobanner -nolisten tcp
:100 local /usr/X11R6/bin/X -nolisten tcp -nobanner
:1000 local /usr/X11R6/bin/X -nolisten tcp

Hope this helps.

konsolebox · 08-16-2010, 08:13 AM

If that's the case, druuna was right. Here's my solution for that.

Code:

sed '/:[0-9]\+ local \/usr\/X11R6\/bin\/X/{ / -nolisten tcp/!s/.*/& -nolisten tcp/; }' file