It also has an "-a" flag that just runs the right compressor based on output file name. "tar -acf archive.tar.gz" and "tar -acf archive.tar.zst" will do the rig

It also has an "-a" flag that just runs the right compressor based on output file name. "tar -acf archive.tar.gz" and "tar -acf archive.tar.zst" will do the right thing in both cases.