Sort command -u removes non-unique item Post: 302898585

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Top Forums UNIX for Dummies Questions & Answers Sort command -u removes non-unique item Post 302898585 by newbie2010 on Tuesday 22nd of April 2014 09:56:30 PM

04-22-2014

Registered User

Sort command -u removes non-unique item

I am wondering why the sort command removes the volume with 0 in it, but orders everything else. I have a list like this:

Code:

cat list1

/vol/list_vol0
/vol/list_vol1
/vol/list_vol2
/vol/list_vol3
/vol/list_vol4
/vol/list_vol5
/vol/list_vol6
/vol/list_vol7
/vol/list_vol8
/vol/list_vol9
/vol/list_vol10
/vol/list_vol11
/vol/list_vol12
/vol/list_vol13
/vol/list_vol14
/vol/list_vol15
/vol/list_vol16

Then the sort command does this:
Why is /vol/list_vol0 removed? Everything else is in proper order
The issue is related to the -u option, but I don't know why it would remove list_vol0 as the entry only appears once. When I remove the -u the sort looks ok. Don't need help on this as I can remove the -u, I just wonder why the -u option would do this.

Code:

cat list1 |sort -u -t_ -n -k2.4

/vol/list_vol1
/vol/list_vol2
/vol/list_vol3
/vol/list_vol4
/vol/list_vol5
/vol/list_vol6
/vol/list_vol7
/vol/list_vol8
/vol/list_vol9
/vol/list_vol10
/vol/list_vol11
/vol/list_vol12
/vol/list_vol13
/vol/list_vol14
/vol/list_vol15
/vol/list_vol16

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LEARN ABOUT FREEBSD

ruptime

RUPTIME(1)						    BSD General Commands Manual 						RUPTIME(1)

NAME

     ruptime -- show host status of local machines

SYNOPSIS

     ruptime [-alrtu] [host ...]

DESCRIPTION

     The ruptime utility gives a status line like uptime(1) for each machine on the local network; these are formed from packets broadcast by each
     host on the network once every three minutes.

     If no operands are given, ruptime displays uptime status for all machines; otherwise only those hosts specified on the command line are dis-
     played.  If hosts are specified on the command line, the sort order is equivalent to the order hosts were specified on the command line.

     Machines for which no status report has been received for 11 minutes are shown as being down, and machines for which no status report has
     been received for 4 days are not shown in the list at all.

     The options are as follows:

     -a      Include all users.  By default, if a user has not typed to the system for an hour or more, then the user will be omitted from the
	     output.

     -l      Sort by load average.

     -r      Reverse the sort order.

     -t      Sort by uptime.

     -u      Sort by number of users.

     The default listing is sorted by host name.

FILES

     /var/rwho/whod.*  data files

SEE ALSO

     rwho(1), uptime(1), rwhod(8)

HISTORY

     A ruptime utility appeared in 4.2BSD.

BSD
								   March 1, 2003							       BSD