6. Starting

The program is supplied with a shell script that processes options and arguments and sets the necessary environment variables. The following options are recognized by this shell script:

argument	description
`-h`	give list of options
`-t`	TTY interface (no graphics)
`-o name`	alternate input/output device
`-2`	stereo mode (OpenGL only)
`-a`	display all atoms instead of backbone
`-s`	superimpose complete backbone
`-r range`	superimpose backbone of given range
`-f file`	execute macro file (`-` for standard input)
files	DG, PDB, Angle or Dump files

If the program is started without names of structure files, it will recover the saved state of the last invocation and neglect all options but -f macro.

Besides the listed options, the program will also recognize standard Xt options, like -bg color for setting the background color.