Script to modify a line in text file

I have a property file, and one of the line in it is like this:

...
useDDSAgent=true
...

I am writing a script to change the value of useDDSAgent to "false". It should be able to open the file, change the value, and save the file. How do I do that?

Thanks.
LVL 9
yongsingAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

liddlerCommented:
sed can do the change, but outputs to a different file (you can't make sed overwirite the origina), so use mv to rename the file

sed -e 's/useDDSAgent=true/useDDSAgent=false/' myfile > myfile.tmp
mv myfile.tmp myfile

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
devrick0Commented:
Also, depending on what version of sed you are running, there is also the -i option (only available in newer versions of sed).  With the -i option, you don't have to create any tmp file and perform moves after the fact.  The file gets modified in place.

So for example:
sed -i -e 's/useDDSAgent=true/useDDSAgent=false/' filename
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Unix OS

From novice to tech pro — start learning today.