github.com/benhoyt/goawk@v1.8.1/testdata/gawk/compare.awk (about)

     1  BEGIN {
     2  	if ("0") print "zero"
     3  	if ("") print "null"
     4  	if (0) print 0
     5  }
     6  {
     7  	if ($0) print $0
     8  	if ($1) print $1
     9  }