jonathan@jonathan-desktop:~$ export AMBERHOME=/home/jonathan/amber12/
jonathan@jonathan-desktop:~$ $AMBERHOME/bin/cpptraj

CPPTRAJ: Trajectory Analysis. V12.5
    ___  ___  ___  ___
     | \/ | \/ | \/ | 
    _|_/\_|_/\_|_/\_|_

INPUT: Reading Input from STDIN, type "go" to run, "quit" to exit:
> parm 1a.prmtop
  [parm 1a.prmtop]
> trajin output.pdb
  [trajin output.pdb]
Warning: In PDB file output.pdb: 3 name mismatches with parm 1a.prmtop.
	[output.pdb] contains 200 frames.
> autoimage
  [autoimage]
> trajout 1a_autoimage.pdb pdb
  [trajout 1a_autoimage.pdb pdb]
> trajout 1a_autoimage(2)
  [trajout 1a_autoimage(2)]
> trajout 1a_autoimage(3).pdb
  [trajout 1a_autoimage(3).pdb]