On 11/6/18 11:46 AM, George Avrunin wrote:
> On Tue, 6 Nov 2018 11:07:22 -0800, Paul Allen Newell <[email protected]>
> wrote:
>
>> Rick:
>>
>> Thanks for reply. I went through a bunch on man pages that do not list
>> the -f option. After getting your email, I went looking for a bunch more
>> and finally found one that had the -f and -d option.
>>
>> I note that 'sync --help' only provides 'Usage: sync [OPTION]' without
>> listing what the options are. I have just followed their suggestion of
>> running "info coreutils 'sync invocation'" which gives alot of options.
>>
>> Not certain why these options are more readily visible. I probably
>> should have dug deeper but after a bunch of online docs showing no
>> options I just figured there weren't any.
>>
>> Paul
>
> On both Fedora 28 and 29 (I don't have any older versions available), "man
> sync" describes the -f option and "sync --help" returns the following:
>
> Usage: sync [OPTION] [FILE]...
> Synchronize cached writes to persistent storage
>
> If one or more files are specified, sync only them,
> or their containing file systems.
>
> -d, --data sync only file data, no unneeded metadata
> -f, --file-system sync the file systems that contain the files
> --help display this help and exit
> --version output version information and exit
>
> GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
> Full documentation at: <https://www.gnu.org/software/coreutils/sync>
> or available locally via: info '(coreutils) sync invocation'
>
> The link to the coreutils documentation gives more detail. (The man page also
> points to that.) I'm not sure why you don't think the options are readily
> visible, unless you're working on non-Fedora (or even non-Linux) systems.
Did a bit of snooping with VMs I have with the following results:
OS "man sync" "sync --help"
--------------- --------------- -------------
F26 Full options Full options
F27 Full options Full options
F28 Full options Full options
F29 Full options Full options
CentOS 7 No options No options
Ubuntu 17 Full options Full options
Ubuntu 18 Full options Full options
So, of the seven OSes I checked, only CentOS 7 didn't offer a full man
page or show the options with "--help". Weird.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital [email protected] -
- AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 -
- -
- Memory is the second thing to go, but I can't remember the first! -
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