Of course it being "common" does NOT mean that everyone knows the convention,
especially people new to Linux. And is NOT an excuse for the man page being
wrong. So, yes, you should be explicit about it, and not be wrong about it in
the man page.
It is -o list and --output=list
On Wed, 6 Jan 2021, David O'Brien wrote:
On 1/5/21 8:27 PM, Karel Zak wrote:
On Thu, Dec 24, 2020 at 11:14:04AM +1000, David O'Brien wrote:
I don't know if this is expected or not, but it seems very odd:
# lsblk -o=UUID /stratis/labpool/labfs
lsblk: unknown column: =UUID
[root@serverb ~]# lsblk -o UUID /stratis/labpool/labfs
UUID
0118efb8-66fe-406a-837c-725961bdad4d
[root@serverb ~]# lsblk --output=UUID /stratis/labpool/labfs
UUID
0118efb8-66fe-406a-837c-725961bdad4d
From the man(8) page:
-o, --output list
Specify which output columns to print. Use --help to get
a list of all supported columns. The columns may affect
tree-like output. The default is to use tree for the
column 'NAME' (see also --tree).
The default list of columns may be extended if list is
specified in the format +list (e.g., lsblk -o +UUID).
There is no mention of "=" being required, causing failures, etc. I found this quite frustrating.
This is common getopt_long() behavior where equal sign is usable only for
long options (and sometimes for optional arguments).
lsblk -o UUID
lsblk --output UUID
lsblk --output=UUID
this is how "=" works in almost all commands and I don't see reason
why we need to be explicit about it for "lsblk -o".
Karel
ok. If it's common and expected that's fine. I don't spend a lot of time with this class/type of command and it was just
new to me and seemed odd.
cheers
--
David
Introvert/Unclubbable/Cool
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