Created 16 Using PCSX2 via CLI (markdown)

16-Using-PCSX2-via-CLI.md

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+## Command Line Options
+PCSX2 can be launched from a command line on both Windows and Linux systems.
+
+Usage: pcsx2.exe [parameters] [--] [boot filename]
+```
+ -help: Displays this information and exits.
+ -version: Displays version information and exits.
+ -batch: Enables batch mode (exits after shutting down).
+ -nogui: Hides main window while running (implies batch mode).
+ -elf <file>: Overrides the boot ELF with the specified filename.
+ -disc <path>: Uses the specified host DVD drive as a source.
+ -bios: Starts the BIOS (System Menu/OSDSYS).
+ -fastboot: Force fast boot for provided filename.
+ -slowboot: Force slow boot for provided filename.
+ -state <index>: Loads specified save state by index.
+ -statefile <filename>: Loads state from the specified filename.
+ -fullscreen: Enters fullscreen mode immediately after starting.
+ -nofullscreen: Prevents fullscreen mode from triggering if enabled.
+ -bigpicture: Forces PCSX2 to use the Big Picture mode (useful for controller-only and couch play).
+ --: Signals that no more arguments will follow and the remaining
+   parameters make up the filename. Use when the filename contains
+   spaces or starts with a dash.
+```
+
+Legacy documentation (including for WX builds and using Steam as a launcher) can be found at the [PCSX2 Wiki](https://wiki.pcsx2.net/Command-line_support).