On 01/15/2015 04:36 AM, Pádraig Brady wrote: > tag 19604 notabug > close 19604 > stop > > On 15/01/15 06:20, prateek goyal wrote: >> Hi, >> >> >> when I try to use --help option with echo command, it does not print help >> contents, but prints "--help". >> >> >> prateek@prateek-pc:~/Documents/awk$ echo --help >> --help > > You're actually using your shell's echo there. > To use the coreutils one: > > env echo --help
Furthermore, the behavior you saw in your shell is required by POSIX. If you do 'env POSIXLY_CORRECT=1 echo --help', you will get the same behavior from coreutils as you did from your shell. 'echo' is one of the few utilities that _cannot_ honor --help for compatibility reasons. > Note newer versions of bash will support $builtin --help, > though I've not tested the echo case which would > introduce a change in behavior. If bash changes the behavior of 'echo --help' in POSIX mode, then that would be a bug in bash. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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