4gig file trying to replace decimal number A with decimal number B
 

I want to change one number string, to another.
I thought it would be easy. But, I'm not finding it.

I thought sed would be just the thing.
I tried the following. But, it does not change the numnber.
sed -n 's/ 6947465.41/ 6947477.98/' minv_tst.txt

This is the record, in the file (wrapped):
1109 111 111 0 0 0 0 0 0 6947465.41 5792148 592988.7

Any ideas with sed, or other linux tools, please let me know.
I am on Centos 6

Thank you

Try
-i stands for in-place. I.e., it will actually modify the file. Ideally try it with a small test file first and have a backup from the "real" file around when you run sed commands on it.

Thank you for the quick response.
It worked!

I'm not new to linux. But, I've never used sed or awk.
I'll tell you, I tried, I don't know how many variations of that code.
I did use the "-i" once or twice. But, I used it along with other "-" options.
When I did that, it actually Zeroed my file.

Anyway, Thank you again!

Tony

No problem, glad you managed to get it working.

Yikes. That's why you should play with test files until you get the commands right.

And be very careful doing global changes. Usually pays to check how many records will be affected first before allowing the change.

Being pedantic, I would escape the period in the search expression, so that the search includes a literal decimal point rather than a match for any character.