How Do I Locate a value in a text file and evaluate it and then write out that line based on the value?

Hello.

I need to use Perl to read through log output from a df -k command on
a Unix server, for each line in the log where the value for %Used is
greater than 60% I need to write that line of the log out to another
text file. The header %Used is located on the line above the actual
value, like this:

%Used
60%

How would I capture and evaluate only the %Used value and no other
values in that line?

The 60% occurs first in the value line followed by a percent value for
inodes used.

Thanks for your help.

Karin Walike
.

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