Find and remove some line

hello im working on shell script to search conf file.
if it find special pattern change it. like:

#send_value=0

change it to

send_value=1
(remove # and replace 0 with 1)

how can i find and replace character on file?

That's what sed does best.

sed 's/#send_value=0/send_value=1/' foo > bar && mv bar foo
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