gmx trjcat -o pdb doesn't work
On gmx-users, someone reported trying
gmx trjcat -f a.pdb b.pdb -o combined.pdb and after preliminary setup, being informed that there were no atom names to write in the file.
Either the atom names present in the input frames should be retained (not possible in the current data structures), or something like
-s sample.pdb supported as a source of such data for each frame written out.
Presumably that means
gmx trjcat -f a.xtc b.xtc -o combined.pdb is also broken, but that is something of a blessing