Regarding who command

UNIX for Advanced & Expert Users
1

Hi,

Currently we r restricting the user's to access only one session using the who command.
Command we used

count=`w | grep -c "$LOGNAME "` or count=`who | grep -c "$LOGNAME "`
let count=$count
if (( $count > 1 )); then
echo "restricted"

But the problem is, It is counting the FTP Session also.
Can anyone help us to provide the solution?

2

Are you talking about local sessions, remote sessions or what?

3

Yes.

Example,

Now i didn't opent the FTP Session
kganeshb@its04487:~ $ who | grep "kganeshb"
kganeshb pts/18 Mar 27 16:06 (its100267mq1s.chennai.ford.com)
kganeshb pts/35 Apr 2 10:00 (its100477mq1s.chennai.ford.com)
kganeshb pts/29 Apr 2 09:55 (its100477mq1s.chennai.ford.com)
kganeshb pts/62 Apr 2 12:28 (its100477mq1s.chennai.ford.com)

With FTP Session

kganeshb pts/18 Mar 27 16:06 (its100267mq1s.chennai.ford.com)
kganeshb pts/35 Apr 2 10:00 (its100477mq1s.chennai.ford.com)
kganeshb pts/29 Apr 2 09:55 (its100477mq1s.chennai.ford.com)
kganeshb pts/62 Apr 2 12:28 (its100477mq1s.chennai.ford.com)
kganeshb vsftpd:17924 Apr 2 14:28 (19.237.45.119)

In unix, who command doesn't count the ftp session but in the Linux it is counting.

4

Try this:

count=`who | grep -v 'ftp' |grep -c "$LOGNAME "`
let count=$count
if (( $count > 1 )); then
echo "restricted"

5

Solution i know, i want the reason why the same problem doesn't occur for unix.