There are a few ways to convert an SVG to a PNG without leaving the shell, including *Magick and Inkscape, but I find rsvg-convert the easiest.

Install with Homebrew on macOS, or FreeBSD pkgng. Note the version number on the latter:

# brew install librsvg
# pkg install librsvg2

Then convert as such:

$ rsvg-convert vector.svg

And you’ll be presented with a PNG:

==> ?g?O2??a?{*pD????껌?Xh???4?mF:,?ɶ?0?c3??nb??ܡ?z?
==> ?5??&?4?KZڴ?;w??qt??6>2???hłr??FM???DZ??#_@??{'y
==> ???d??$???xB??birdistheword5??{|?9?ND?x{?????mPJ
==> ?????V?@?'?W\7?M~???h?(RD1???cx@?^E???wy?뢪???ˏ?
==> ;?*??z;KFåIP?L???b??2)??_?HgH?E??9\?̽?Wr?N???J???
==> ?p?4#7O??^e#Ւ?%,{O41?J??}1?$7H???,?I??S?T?/?[ӹ??
==> ??~IA70=????к\??|?<f_??kb?\j|?d?Ә??ʭ??dٌ?

Whoa! I wasn’t expecting that. Let’s redirect somewhere useful:

$ rsvg-convert vector.svg > raster.png

Or even better, use the output flag:

$ rsvg-convert --output raster.png vector.svg

More details are available with --help, or on the manpage(1).