npm start error

[harshvardhan12]

sed -i.bak s/bundle.min.js/bundle.js/g index.html && rm index.html.bak

'sed' is not recognized as an internal or external command,
operable program or batch file.

while i run the command npm start i got the following error.

[sohamkamani]

Are you running this on something other than a unix shell? "sed" is a command line tool present in linux and mac, so if you are running this on something like windows, it wont work.