Hi,
No, that isn't possible.
However, note that you can pass one or more scripts that will be executed just after the startup process. Scripts can dynamically generate and execute process instances, and the last of those scripts can issue an "exit" command (or even "exit --force" to exit unconditionally ignoring any modified images etc.), so you can cause PixInsight to terminate and return to the caller.
Note also that PixInsight's graphical interface cannot be avoided; it will always be initialized because a significant part of PI's infrastructure depends on GUI resources.
BTW, just for the record, command line arguments have changed slightly in version 1.6.9 due to a redesign of PI's internal security system, the new updates sytem and other improvements. Here is the output of "./PixInsight --help" for version 1.6.9.652:
PixInsight Core 01.06.09.0652 (x86_64)
Copyright (C) 2003-2010 Pleiades Astrophoto
Usage: PixInsight [<arg_list>] [<url_list>]
<url_list>
is a sequence <url> [<url_list>]
<url>
is a URL specification to an existing file. Supported file types include
images of any installed image format, Process Set Module files (.psm),
script files (.js, .jsh, .scp), and plain text files (.txt, files with no
suffix, and a number of source code file types such as .c, .cpp, .h, etc).
URLs must conform to the URI specification from RFC 3986 (Uniform Resource
Identifier: Generic Syntax). For remote URLs, the HTTP and FTP protocols
are fully supported with optional user authentication.
For local path specifications, wild file names are fully supported via
standard * and ? wildcards.
<arg_list>
is a sequence <arg> [<arg_list>]
<arg>
is a valid argument specification. Valid arguments are:
--startup-script=<file_path>
<file_path> is a path specification to a local script file that will be
executed as part of the startup procedure. By default, the standard
"startup.scp" script is executed, unless the --no-startup-script
argument is specified (see below).
--no-startup-script
Don't execute any startup script.
--no-splash
Don't show a nice splash window during startup.
-m=<file_path> | --module=<file_path>
<file_path> is a local path specification to a PixInsight module that
will be installed upon startup. This argument can be used multiple
times to define a set of modules that will be installed in the order
they appear on the command line.
-s=<file_path> | --script=<file_path>
<file_path> is a local path specification to a script that will be featured
(if the script provides valid feature preprocessor directives) upon startup.
This argument can be used multiple times to define a ser of scripts that
will be featured in the order they appear on the command line.
-r=<file_path> | --run=<file_path>
<file_path> is a local path specification to a script file that will be
loaded and executed just after the startup procedure. This argument can
be used multiple times to define an ordered set of scripts that will be
executed after the startup script.
--backup-conf
Write a backup copy of the current PixInsight configuration file on the
user's home directory. The backup file is generated prior to any reset of
configuration settings.
--reset-all
Forces a reset of all configuration settings. This includes all
preferences, pixel readout options, color management settings, and global
RGBWS parameters.
--reset-color-management
Resets color management settings to default values.
--reset-preferences
Resets all user preferences to default settings.
--reset-readout-options
Resets pixel readout options to default settings.
--reset-RGBWS
Resets global RGB Working Space parameters to default values.
--reset-printer
Resets the global printer object to default settings.
--default-modules
Resets the set of installed modules to the default standard set. After
scanning the bin installation directory looking for valid PixInsight
modules, the core application will try to install all modules found.
Other modules that could have previously been installed will be discarded.
--default-scripts
Resets the set of featured scripts. After scanning the src/scripts
installation directory looking for scripts, the core application will
create entries for all valid scripts found under the Script menu. Other
scripts that could have previously been featured will be discarded.
--default-favorites
Resets the Favorite Processes category to the factory-default set, which
is version-dependent. The previous selection is lost.
--no-modules
Do not install any modules. Any modules installed during this session will
be discarded. The core application will install the current set of modules
the next time it is executed without this argument.
--no-scripts
Do not feature any scripts. Any scripts featured during this session will
be discarded. The core application will load the current collection of
featured scripts the next time it is executed without this argument.
--uninstall
Runs the PixInsight core application in uninstall mode. This is a special
execution mode reserved to erase all PixInsight configuration settings
for the current user. A modal dialog box asks for confirmation before
actually erasing all settings. The uninstall mode can also be triggered
by running the core application with the Ctrl key pressed.
--print-environment
Writes the names and values of all environment variables to stdout.
--r[+|-]
Enables/disables recursive directory search for wildcard local file
specifications. Each occurrence of this argument applies to local file
items following it on the command line.
--help
Displays this help and exits.
