bash script to insert ip address into property file

Question

I have a property file with an entry such as this:

some.url={ipaddress}/blah

I want to substitute the {ipaddress} with the ip of machine its running on.

I found this command:

ipconfig getifaddr en0

which outputs the ip.

I also found sed is useful for this sort of thing but I can't quite put it all together.

sed -i '' 's/{ipaddress}/192.168.0.1/g' test.properties

Where the hard-coded ip address 192.168.0.1 needs to be substituted for the machine's one.

Can anyone help?

use double quotes instead of single quotes for variable expansion. — Avinash Raj
– Avinash Raj, Commented May 27, 2014 at 16:26
i need more information such as how to capture the output of the ipconfig command to a variable to then use in the sed command. — FinalFive
– FinalFive, Commented May 27, 2014 at 16:28
Seems like you need to learn the basics of shell scripting, then. Capturing the output of a command is one of the first things you'll learn. — Barmar
– Barmar, Commented May 27, 2014 at 16:29
The g at the end of this sed expression will cause all instances of "{ipaddress}" to be replaced. Make sure that is what you want. Or do you just want to replace the instance on lines that begin with "some.url="? — Digital Trauma
– Digital Trauma, Commented May 27, 2014 at 16:31

tkocmathla · Accepted Answer · 2014-05-27 16:29:36Z

2

You can store the result of the ipconfig command in a variable like this:

ip=$(ipconfig getifaddr en0)

Then interpolate it into your sed command by surrounding the expression with double-quotes:

sed -i "" "s/{ipaddress}/$ip/g" test.properties

answered May 27, 2014 at 16:29

tkocmathla

91111 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jotne · Accepted Answer · 2014-05-27 16:35:29Z

0

Try this:

cat file
some.url=10.10.10.5/blah

awk -F"=|/" '{print $1 "=" ip "/" $3}' ip=$(ip route get 8.8.8.8 | awk '{print $NF;exit}') file
some.url=192.168.1.30/blah

ip route get 8.8.8.8 | awk '{print $NF;exit}' is one of the best way I have found to get correct IP. It works even on VPS servers and on servers with multiple IP

answered May 27, 2014 at 16:35

Jotne

41.7k13 gold badges54 silver badges58 bronze badges

Collectives™ on Stack Overflow

bash script to insert ip address into property file

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related