who: sorted output + minor usage change

[Assaf Gordon]

Hello,

Two suggestions for 'who':

first,
the --help text for '-u/--users' option is not clear (IMHO).

'who --help' says:
   -u, --users       list users logged in

Whereas the Coreutils manual says:
"-u => After the login time, print the number of hours and minutes that the user has 
been idle. [...]"

And posix says ( 
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/who.html ):
"-u => Write "idle time" for each displayed user in addition to any other 
information. [...]".

so, except in the --help text, it talks about showing idle time.
Perhaps consider slightly modifying the usage text? (that's the first patch 
attached).


second,
would you consider adding a 'sort' option to sort output by different fields?
The attached patch implements this.
examples:
  who -a --sort=idle
  who -a --sort=name
  who -a --sort=line

Normally, piping to 'sort' should be enough, but the fields output by 'who' are 
not fixed, so sorting with whitespace delimiters is tricky,
and sorting by exact character position is messy, and depends on the option 
used.
Also, for sorting by idle time, the field conains mixed digits and characters (e.g. "." 
for recently active, and "old" for not active) - not easily sorted.

comments are welcomed,
 - Assaf

who-sort.patch
Description: Text Data