tag 21416 notabug thanks On 09/04/2015 12:57 PM, Robert "Finny" Merrill wrote: > ~/workspaces/diags-dev/s1 @bs360.sjc> /bin/echo --help > Usage: /bin/echo [SHORT-OPTION]... [STRING]... > or: /bin/echo LONG-OPTION > Echo the STRING(s) to standard output. > *snip*
This is a GNU extension; it is not POSIX compliant, but can easily be overridden, as shown below. > ~/workspaces/diags-dev/s1 @bs360.sjc> /bin/echo -- --help > -- --help Thanks for the report. However, this is working as required by POSIX: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html "The echo utility shall not recognize the "--" argument in the manner specified by Guideline 10 of XBD Utility Syntax Guidelines; "--" shall be recognized as a string operand." "Implementations shall not support any options." > > There doesn't seem to be a way to get /bin/echo to output the string "--help" Ah, but there is: $ POSIXLY_CORRECT=1 /bin/echo --help --help Also, POSIX says that 'echo' is outdated (not only because it violates the standard syntax rules, but also because it has non-portable handling of \), and that you should strongly consider using printf, in which case, you would do: $ printf -- %s\\n --help --help -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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