curl www.site.com | grep stuff | sed "other stuff"

curl -s www.site.com

curl www.site.com -o file.txt >/dev/null 2>&1
cat file.txt | grep stuff | sed "other stuff"

curl -s www.site.com 2>/dev/null | grep stuff | sed "other stuff"

curl www.google.com -o /dev/null

time (curl www.google.com -o /dev/null)