Added help; changed 'infile' to 'input-file' for style consistency

Author: jakekara

HELP

@@ -0,0 +1,10 @@
+usage: pyshuf [-h] [-e] [-i lo-hi] [-n count] [--input-file INPUT_FILE]
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -e, --echo            Treat each command-line operand as an input line
+  -i lo-hi, --input-range lo-hi
+                        Act as if input came from a file containing the range of unsigned decimal integers lo...hi, one per line.
+  -n count, --head-count count
+                        Output at most count lines
+  --input-file INPUT_FILE

pyshuf/__main__.py

@@ -43,7 +43,6 @@ def lo_hi(lo_hi_str):
 def main():
 
     parser = argparse.ArgumentParser()
-    parser.add_argument("--infile", type=file)
     parser.add_argument("-e","--echo",
                         action="store_true",
                         help="Treat each command-line operand as an input line")
@@ -54,6 +53,7 @@ def main():
                         metavar="count",
                         type=int,
                         help="Output at most count lines")
+    parser.add_argument("--input-file", type=file)
 
     try:
         args, unk = parser.parse_known_args()