[SOLVED] Find and replace text in file

mathewrond · 04-01-2016, 03:28 PM

I have a file with an IP address that I wanted to change with a different IP address. I am using RedHat Linux, could you please let me know how I can do this?

Code:

10.1.1.2:10025      inet  n       -       n       -       -       smtpd
10.1.1.2:10026      inet  n       -       n       -       -       smtpd

I wanted to replace text before :10025 and :10026 with a different IP address. e.g. 10.2.2.5 so the final output in the file is

Code:

10.2.2.5:10025      inet  n       -       n       -       -       smtpd
10.2.2.5:10026      inet  n       -       n       -       -       smtpd

Can anyone help with this?

ardvark71 · 04-01-2016, 04:26 PM

Hi...

I'm guessing this is from a regular text file? If so, simply gain root access (or the root account,) if you don't already have it and use gedit (or another text editor) to open and change the file information as you have shown.

One way of doing this is explained here but you could also just double click on the file in question.

Regards...

grail · 04-01-2016, 05:28 PM

sed would also be a good choice.

WayneB · 04-01-2016, 08:52 PM

If it's a simple search and replace, this is how it's done.

Code:

sed 's/10.1.1.2/10.2.2.5/g' /etc/hosts

The code above will not make changes to your original file. You're just modifying the output of sed against the file. This is like a preview to check if the results are what you want.

If the code produces the desired output with the new IP change, run the code again with -i to sed to overwrite /etc/hosts.

Code:

sed -i 's/10.1.1.2/10.2.2.5/g' /etc/hosts

frankbell · 04-01-2016, 09:44 PM

In case it helps, Dave Morriss is doing a series on sed at Hacker Public Radio.

MadeInGermany · 04-02-2016, 05:35 AM

Regarding the sed solution, the following might be closer to your requirement

Code:

sed 's/[^:]*\(:1002[56]\)/10.1.1.2\1/' file

I.e. restore a part of the search pattern by means of \( \) and its reference \1

John VV · 04-02-2016, 05:45 PM

open the file in gedit
and click on edit/ find and replace

wpeckham · 04-02-2016, 06:25 PM

sed can do this, perl can also, gsar is made for such things as well.
You have a simple pattern search and replace, twice. Easy.
Man pages will help, but there are tons of how-to pages on these utilities.

mathewrond · 04-03-2016, 10:04 PM

Thank you for your suggestion, MadeInGermany. This is exactly what I was looking for.

ardvark71 · 04-03-2016, 11:20 PM

Quote:

Originally Posted by mathewrond

Thank you for your suggestion, MadeInGermany. This is exactly what I was looking for.

Glad you got it resolved.

Regards...