[SOLVED] Any suggestion for my 'sed' syntax? I am getting Error

TashiDuks · 12-02-2016, 02:21 AM

I am trying to update a configuration file value. My configuration has got following value:

Code:

"mailhost": ["20.20.20.1", 25],

I want to change the value 20.20.20.1 only excluding rest characters to something to 30.30.30.1. I have following script lines which I came up with:

Code:

sudo sed -i 's/\("mailhost": ["\).*\(, 25]\)/\1 "'30.30.30.1'" \2/g' mymy.conf

I get "sed: -e expression #1, char 52: invalid reference \2 on `s' command's RHS" message." syntax error message.

Can anyone help me please?

I also tried using following syntax (got by searching in google) but still the error message is same.
Syantx example(GOOGLE):

Code:

 sed 's/\(*string1\).*\(string3.*\)/\1string2\2/' mymy.txt

The syntax which i used

Code:

 sudo sed 's/\(*"mailhost": ["\).*\(", 25],.*\)/\1"30.30.30.1"\2/' mymy.conf

Thanks

grail · 12-02-2016, 02:48 AM

You have only shown part of the line so my answer is based only on this portion and may fail if the line has other data that my regex will match:

Code:

sed '/mailhost/s/[0-9][^"]*/30.30.30.1/'

As to your own solution, grouping heer would seem to make the solution more complicated and adding 'g' implies you want to perform more than a single change, should they exist.

So without seeing more of the data, my current solution is my suggestion.

TashiDuks · 12-02-2016, 03:02 AM

@grail ... Thanks mate. You made my day, it worked.

I Used this:

Code:

sed -i '/mailhost/s/[0-9][^"]*/30.30.30.1/' mymy.txt

Tashi