Help me with command in linux

learnlinuxvn · 12-25-2015, 03:09 AM

Let me ask you use who command if I only want to show only the username and login now how I have

Keruskerfuerst · 12-25-2015, 03:18 AM

The login name is displayed on the very left side.
If $ is displayed, you are logged in as user.
If # is displayed, you are logged in as root.

learnlinuxvn · 12-25-2015, 03:24 AM

I want to filter condition show who command to display only the login names and hours logged

NoStressHQ · 12-25-2015, 04:18 AM

Quote:

Originally Posted by learnlinuxvn

I want to filter condition show who command to display only the login names and hours logged

Well... A little bit of English improvement would be a GREAT help for the rest of your work... As docs are written in english and to get proper help, it's better to be understood... I'm not sure we understand what you want...

I guess... That you want to display some info exclusively... So:
1. man man.... USE MAN... man who => Why ? Because OFTEN an argument does what you want.
2. then: "man whatever-you-need"...
3. finally LEARN: grep, sed, awk, Bash (or eq).... Grep/sed helps you to filter text... awk kinda-parse records..

Good luck.

Garry.

PS/ $ who -s ??

jamison20000e · 12-25-2015, 08:30 AM

Code:

man who

...

wpeckham · 12-25-2015, 08:32 AM

Agree with above, your meaning is unclear.

Do you mean you want the logon name and time for the users currently logged in?

That can be pulled in several ways, and filtered in several ways to avoid displaying what you do NOT want.

I have a snip that may be useful:

Code:

#!/bin/bash
# awkc - print out one or more columns

p=\$$( echo $1 | sed 's/,/,\$/g' )
shift
eval "awk '{ print $p }'" $*

#eof

I place this in a script names acol and drop it in /usr/local/bin with permissions 755.

Using that I might try

Quote:

who|acol 1,3,4

to see if that is what was wanted.

Please let us know is that helps. If not, please provide more detail about your question and need.

Greg321 · 12-25-2015, 03:14 PM

Quote:

Originally Posted by learnlinuxvn

Let me ask you use who command if I only want to show only the username and login now how I have

Since you only want the username and login time, here it is. The first line is the code and below it is the output of the code:

Code:

who | awk '{ print $1, $4 }'

greg 14:57
greg 14:57
greg 15:25
greg 15:36

To add a title for each field

Code:

who | awk 'BEGIN { printf "%-19s" "%-9s\n", "User", "Login Time" } { printf "%-19s" "%-7s\n", $1, $4 }'
User              Login Time
greg              14:57  
greg              14:57  
greg              15:25  
greg              15:36

There is also the w command which is similar to who with gives additional info.

Code:

w

16:04:23 up  1:08,  4 users,  load average: 0.18, 0.15, 0.14
USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
greg     :0        14:57   ?xdm?  11:41   0.04s /bin/sh /usr/bin/startkde
greg     pts/0     14:57    1:07m  0.00s  0.72s kdeinit4: kded4 [kdeinit]
greg     pts/1     15:25   29:05   0.06s  0.06s /bin/bash
greg     pts/2     15:36    1.00s  0.16s  0.00s w

Another command is last. You can use this command to see current and passed logins.

There you have it. who, w, and last.

Enjoy!

AnanthaP · 12-26-2015, 02:09 AM

I think he want who am i with hours logged

OK

NoStressHQ · 12-26-2015, 04:12 AM

Quote:

Originally Posted by AnanthaP

I think he want who am i with hours logged

OK

I think that's something "in the way"... But WHERE does he want that ? I suspect it is for the prompt, but maybe I'm wrong...

wpeckham · 12-26-2015, 08:46 AM

I think that at this point we need to wait for the OP to fill us in on what he really needs. We have offered a couple of possible answers to the question he almost asked, and without clarification we are just spinning our wheels. We need direction, and the OP can provide that.

Greg321 · 12-26-2015, 02:27 PM

Quote:

Originally Posted by AnanthaP

I think he want who am i with hours logged

OK

I'm just going with what the OP supplied us. As wpeckham said, we need feedback from the OP if our suggestions had help or not or we're just spinning our wheels on guesses.

As mentioned earlier, Op can try w and last to get additional information on logins.

There is another approach called process accounting. It logs users logins and length of time and what they did, etc. The package name is call psacct

the command is ac

NoStressHQ · 12-26-2015, 02:43 PM

Well in fact looking at his other posts, it seems he's a lamer... Asking here for us doing his homework for free...

Of course as he can't speak minimal English, don't expect any gratitude

.

Greg321 · 12-26-2015, 04:07 PM

Quote:

Originally Posted by NoStressHQ

Well in fact looking at his other posts, it seems he's a lamer... Asking here for us doing his homework for free...

Of course as he can't speak minimal English, don't expect any gratitude

.

Yep, we're not mind readers