Enable xonsh-cat for invocation directly from OS shell.

news/is_3661.rst

@@ -21,6 +21,8 @@
   When multiple interpreters are in PATH, 'py' will choose the first one (usually in the virtual environment),
   but 'py -3' finds the system-wide one, apparently by design.
 
+* For xonsh-cat, avoid parsing and processing first (0'th) argument when invoked directly from OS shell.  
+
 
 **Security:**
 

setup.py

@@ -379,7 +379,7 @@ def main():
         "pytest11": ["xonsh = xonsh.pytest_plugin"],
         "console_scripts": [
             "xonsh = xonsh.main:main",
-            "xonsh-cat = xonsh.xorutils.cat",
+            "xonsh-cat = xonsh.xoreutils.cat:cat_main",
         ],
     }
     skw["cmdclass"]["develop"] = xdevelop

xonsh/xoreutils/cat.py

@@ -161,7 +161,7 @@ def cat_main(args=None):
     from xonsh.main import setup
 
     setup()
-    args = sys.argv if args is None else args
+    args = sys.argv[1:] if args is None else args
     cat(args, sys.stdin, sys.stdout, sys.stderr)