running shell command locally and over ssh

PoleStar · 07-21-2012, 02:24 PM

Hello,

I ran following command on the server and it brought back required information.

Code:

> cut -d: -f1 /etc/passwd | while read xxx ; do  last $xxx | head -n 1   ; done;

Code:

root     pts/0        XX.XXX.2.173     Tue Oct 18 10:30 - 11:22  (00:51)

But when we run same command over ssh it doesn't bring the same results.
It seems like over ssh $xxx could not hold information.
Below seems like it run

Code:

last

command with out any variable in $xxx.

Code:

ssh user@localhost " cut -d: -f1 /etc/passwd | while read xxx ; do  last $xxx | head -n 1   ; done;"
user@localhost's password: 
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
user pts/0        XX.XXX.XXX.123    Sat Jul 21 14:10   still logged in   
[user@linux ~]$

antegallya · 07-21-2012, 07:41 PM

Hello,

That is because the expanson of $xxx happens in the shell of your local machine before issuing the ssh command.
Simply replace the double quotes by simple quotes ' and it will work ;-)

Regards,
Antegallya

PoleStar · 07-22-2012, 01:22 PM

Code:

\$xxx

worked.
Thanks for the idea.