avatar size) before copying to text/avatars.
Use '-file=<filename>', rather than -f.
Export/share an avatar library like this:
  jsexec avatars export=syncdata -file=../text/avatars/custom.bin
Export user's avatars like this:
  jsexec avatars export=syncdata -users
Import avatars (users and shared libraries), like this:
  jsexec avatars import=syncdata
(replace syncdata with the correct code for the syncdata sub)