topic Re: Show logins on Red Hat Linux in Operating System - Linux

Show logins on Red Hat Linux

Ejnar Svejstrup_1 — Thu, 08 Sep 2005 03:04:08 GMT

Hi,
On HP/UX we have the command "logins" which shows the user logins on the system. Does anybody know a similar command for Red Har Linux.

Thanks...

Re: Show logins on Red Hat Linux

Ralph Grothe — Thu, 08 Sep 2005 05:09:55 GMT

Hi Ejnar,

we run several Linux boxes with RHEL3.

To my knowing a logins command or act-alike doesn't come with the standard distros.

I guess you could obtain sources from logins
(maybe GNU or similar) and try to build it on RH.

However the functionality logins offers can easily be scripted by parsing /etc/passwd
(shell, awk, perl, python, or C getpw* syscalls).
Mostly a mere shell alias will suffice.

So I think it isn't really necessary to have a logins implementation for Linux.

Re: Show logins on Red Hat Linux

Muthukumar_5 — Thu, 08 Sep 2005 05:22:05 GMT

Try this.

// logins.c
#include
#include
#include

main()
{
struct passwd *pwd;
pwd=getpwent();
while (pwd != NULL )
{
printf ("%-15s %-6d %-15s %-6d %s\n",pwd->pw_name,pwd->pw_uid,pwd->pw_name,pwd->pw_gid,pwd->pw_gecos);
pwd=getpwent();
}

endpwent();
}

# make logins
# ./logins

hth.

Re: Show logins on Red Hat Linux

RAC_1 — Thu, 08 Sep 2005 07:01:40 GMT

Slow login may also be related to host name resolution.

telnet ip_address
telnet host_name

Which one is slow, if second then it may be the way host name resolution is configured. If first, you need to explore more to know the problem of it.

Re: Show logins on Red Hat Linux

Ivan Ferreira — Thu, 08 Sep 2005 08:02:11 GMT

If the "logins" command shows a list of users on the system, you can use:

awk -F ":" '{ print $1 }'

If you do not use local authentication:

getent passwd |awk -F ":" '{ print $1 }'

Re: Show logins on Red Hat Linux

Rick Garland — Thu, 08 Sep 2005 10:41:20 GMT

Here is an example of using 'awk' to parse through the passwd file.

This example will list the UIDs in use and will present the information so you can see if duplicate UIDs are in use.

Re: Show logins on Red Hat Linux

Steven E. Protter — Thu, 08 Sep 2005 12:57:24 GMT

Just ran a test. The standard user report passwd -sa does not work on Linux.

awk script will have to be used.

or.

last | sort -u | more

That will provide you a list of accounts that were actually used.

SEP

Re: Show logins on Red Hat Linux

Dave Falloon — Fri, 09 Sep 2005 13:55:07 GMT

I'm not familiar with the HP logins command but if you want to see a list of the last time anyone has logged in use:

lastlog

Or for currently logged in users:

who

If you want to see a password file style list of all users that can log into a system run:

getent passwd

--Dave

Re: Show logins on Red Hat Linux

Raj D. — Sat, 10 Sep 2005 04:58:10 GMT

Hi Ejnar ,

Here it is :

# sort -t: -k 3n,3 passwd | awk -F ":" '{printf ("%-20s %7s %7s %s\n", $1,$3,$4,$5)}'

Enjoy , Have fun,
Cheers ,
Raj.

Re: Show logins on Red Hat Linux

Jeff Hoevenaar — Tue, 13 Sep 2005 10:09:44 GMT

how about:

who -u

OR

finger

Re: Show logins on Red Hat Linux

Matthew_50 — Tue, 13 Sep 2005 11:25:55 GMT

try 'finger', 'w', 'who'