https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13984
--- Comment #5 from Gerald Combs <ger...@wireshark.org> ---
Given that ? is a globbing character in most shells, the output of `tshark -G
?` depends on having any single-character filenames in your directory.
For example, bash on macOS prints the usage summary when no single-character
file is present and an error message if one is:
----
$ ls ?
ls: ?: No such file or directory
$ tshark -G ? | head -5
TShark (Wireshark) 2.5.0 (v2.5.0rc0-648-gfe0e6e3)
Usage: tshark -G [report]
Glossary table reports:
$ touch a
$ ./cmbuild/run/tshark -G ? | head -5
tshark: Invalid "a" option for -G flag, enter -G ? for more help.
----
cmd.exe on Windows 7 prints the default glossary if no single-character file is
present and the usage summary if one is:
----
c:\test>dir ?
Volume in drive C has no label.
Volume Serial Number is 68EB-7490
Directory of c:\test
08/16/2017 01:59 PM <DIR> .
08/16/2017 01:59 PM <DIR> ..
0 File(s) 0 bytes
2 Dir(s) 3,862,257,664 bytes free
c:\test>tshark -G ? | head -5
P Short Frame _ws.short
P Malformed Packet _ws.malformed
P Unreassembled Fragmented Packet _ws.unreassembled
F Expert Info _ws.malformed.dissector_bug FT_NONE
_ws.malformed0x0
Dissector bug
F Expert Info _ws.malformed.reassembly FT_NONE
_ws.malformed0x0
Reassembly error
c:\test>touch a
c:\test>tshark -G ? | head -5
TShark (Wireshark) 2.5.0 (v2.5.0rc0-705-ge7284adcdf)
Usage: tshark -G [report]
Glossary table reports:
----
Would it make sense to print a usage summary when the length of the argument
passed to "-G" is 1?
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