first four lines using awk

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i am trying to print out the first four lines using awk. How can i do this?

awk 'NR<5' filename

Of course, you can use just head ...

thanks, that worked great!

better

awk '{ if ( NR < 5 ) { print } else { exit } }' filename

True,
or

awk 'NR>4{exit}1' filename