Re: Where do I find the definitive man page for mdadm?

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

Greg Wooledge wrote:
> > unicorn:~$ sudo lsblk -o +UUID

David Wright wrote:
> You shouldn't require root for either blkid or lsblk,
> though the former needs a path, and does include a
> warning that the information may be read from cache.

This depends highly on the age of the system.
On Debian 8 you don't get much UUID from the system disks without the
permission to read them.
On Debian 10 lsblk seems to depend mostly on udev's assessment.


> > ├─sda1   8:1    0   260M  0 part /boot/efi  4C30-7972

The universe must be small where this FAT UUID is unique.


> One question about lsblk, though: why does it always
> use the xterm width to format the output, regardless of
> whether you redirect the output and the value of COLUMNS.

For me on Debian 10 it does not care about the terminal size.
If i request a few sometimes lengthy fields from lsblk -h i get 206 bytes
per line (plus newline) printed to stdout:

  $ lsblk -o NAME,KNAME,FSTYPE,LABEL,UUID,PARTTYPE,PARTLABEL,PARTUUID,MODEL,SIZE | head -1 | wc -c
  207

In the newest version of the man page
  https://sources.debian.org/src/util-linux/2.37.2-4/misc-utils/lsblk.8/#L179
i see an option which is not in the Debian 10 man page:

  \fB\-w\fP, \fB\-\-width\fP \fInumber\fP
  .RS 4
  Specifies output width as a number of characters. The default is the
  number of the terminal columns, and if not executed on a terminal,
  then output width is not restricted at all by default. This option
  also forces \fBlsblk\fP to assume that terminal control characters
  and unsafe characters are not allowed. The expected use\-case is for
  example when \fBlsblk\fP is used by the \fBwatch\fP(1) command.


Have a nice day :)

Thomas