STRUCTS option
A "STRUCTS" option specifies the input file(s) for one or more structures.
File formats are recognized by the filename extension.
It may be a single structure file with extension
.pdb,
.cif or
.mmcif.
A file with extension .files is a text file containing
filenames or pathnames. There must be one filename per line.
If the STRUCTS option is the filename or pathname of a directory, it is scanned for
files with known extensions including .files and
structure extensions.
With both .files and directories, the search is
recursive; if a directory contain a sub-directory then the sub-directory
is also scanned, a .files
may contain a directory or another .files, and so on.
Compressed files in
.gz format are supported, e.g. .pdb.gz,
except for .files and .bca.
