Curl/sed command not processing inputs correctly

I’m having some trouble with getting this to do what I want it to do.

read -p "URL to read: " U

read -p "Word to fin: " O

read -p "Filename: " F

curl -O $U | sed "s/<$O>/*$O*/g" > $F.txt

JavaScript
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read -p "URL to read: " U​read -p "Word to fin: " O​read -p "Filename: " F​curl -O $U | sed "s/<$O>/*$O*/g" > $F.txt​

So basically what I want is to use curl to get a .txt file from a url, then sort through it to find the word specified by the user input. Then mark all those words with a * and put them in a file specified by the user. Almost the exact same code works in Linux, but this doesn’t work on my Mac. Anyone got an idea?

Answer

Two issues:

-O makes curl store the downloaded file, not output it on stdout.
word boundary metacharacters < and > are a GNU extension. On BSD sed, you can use [[:<:]] and [[:>:]] instead.

This should work on OSX:

curl "$U" | sed "s/[[:<:]]$O[[:>:]]/*$O*/g" > $F.txt

JavaScript
 
curl "$U" | sed "s/[[:<:]]$O[[:>:]]/*$O*/g" > $F.txt​

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Answer