Re: [linux-lvm] indistinguishable column names ( BA Start Start Start Start )

From: Roland <devzero@web.de>
To: LVM general discussion and development <linux-lvm@redhat.com>,
	Marian Csontos <mcsontos@redhat.com>
Subject: Re: [linux-lvm] indistinguishable column names ( BA Start Start Start Start )
Date: Tue, 22 Aug 2023 11:01:38 +0200	[thread overview]
Message-ID: <bd62f79b-7962-d6ff-0533-0d106a9111c8@web.de> (raw)
In-Reply-To: <CAJNi=Xo+4ti+bwfAWMO1Ocxa9zaiz0989pHQAoC0-2hhYOij-g@mail.gmail.com>

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Hi,

 > Hi Roland, is `lvs --reportformat json` or `lvs --nameprefixes` good
enough?

good when using scripting / automated processing - but not good, when we
need it human readable.

i'd even would call it a bug, when using same strings for "translated"
names.

would anybody accept something like this (just for saving column space)
?  ok, that's a little bit over the top - but i wand to underline what i
mean

getpersondetails -o forename, surname, streetname, cityname

name        name    name            name
john          doe      highstreet     washington

roland

Am 21.08.23 um 18:00 schrieb Marian Csontos:
> Hi Roland, is `lvs --reportformat json` or `lvs --nameprefixes` good
> enough?
>
> On Sat, Aug 19, 2023 at 6:06 PM Roland <devzero@web.de> wrote:
>
>      > furthermore, it's a little bit weird that some columns being
>     printed
>     by default when using -o, is
>      > there an easier way to remove those besides explictly removing
>     them
>     one by one with several -o options ? "-o-opt1,-opt2,..." doesn't work
>
>     sorry for this noise, i was too dumb for that , "-o+opt1,opt2
>     -o-opt3,opt4" works as desired (as documented in manpage)
>
>      > themselves,and there also seems no way to add separators in
>     between
>     (like with printf) for separation/formatting
>
>     also sorry for this, as we can use --separator="," (apparently did
>     have too much coffee and had overseen that in the manpage)
>
>     the question regarding native column headers/description remains
>
>     roland
>
>     Am 19.08.23 um 17:20 schrieb Roland:
>     > hello,
>     >
>     > does somebody know how we can have native (i.e. non translated)
>     column
>     > field names in first line of output of pvs ?
>     >
>     > in its current implementation, output is hard to read ,
>     difficult to
>     > distinguish and also not scriptable/parseable, as whitespace is
>     used
>     > for field separator and there are fields which also contain
>     whitespace
>     > themselves,and there also seems no way to add separators in between
>     > (like with printf) for separation/formatting
>     >
>     > # pvs --units s -o+pv_ba_start,seg_start,seg_start_pe,pvseg_start
>     >   PV         VG        Fmt  Attr PSize        PFree BA Start Start
>     > Start Start
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S
>     > 2097152S     1     0
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S
>     > 2097152S     1     1
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S 0S     0 
>     5309
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S 0S     0 
>     5587
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S 0S     0 
>     5588
>     >
>     > i mean like this:
>     >
>     > # pvs --units s -o+pv_ba_start,seg_start,seg_start_pe,pvseg_start
>     >   PV         VG        Fmt  Attr PSize        PFree pv_ba_start
>     > seg_start seg_start_pe pvseg_start
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S    0S
>     > 2097152S            1           0
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S 0S          0S
>     > 2097152S            1           1
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S 0S       
>         0
>     >        5309
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S 0S
>     > 0        5587
>     >   /dev/sdb   VGrecycle lvm2 a--  11720982528S    0S 0S 0S
>     > 0        5588
>     >
>     > furthermore, it's a little bit weird that some columns being
>     printed
>     > by default when using -o, is there an easier way to remove those
>     > besides explictly removing them one by one with several -o
>     options ?
>     > "-o-opt1,-opt2,..." doesn't work
>     >
>     > # pvs --units s -o+pv_ba_start,seg_start,pvseg_start,seg_start_pe
>     > -o-vg_name -o-pv_name -o-pv_fmt -o-attr -o -pv_size -o -pv_free
>     >   BA Start Start    Start Start
>     >         0S 2097152S     0     1
>     >         0S 2097152S     1     1
>     >         0S       0S  5309     0
>     >         0S       0S  5587     0
>     >         0S       0S  5588     0
>     >
>     > roland
>     >
>     _______________________________________________
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>
>
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