Get unix 'top' command output from Expect script

Question

All,
EDIT
I want to execute a unix statement in Expect script and get an output without having to include the interact statement.The unix statement outputs rsize value for a process. I haven't programmed in Expect before. This is my code:

 #!/usr/bin/expect set some_host "some host" set Mycmd "top -l 1 -stats pid,rsize,command | grep Process_Name| awk '{print \$2};'" spawn telnet localhost $some_host expect "login:" send "myDevice\r" expect "Password:" send "$password\r" expect "\$" send "$Mycmd\r" interact 

If I don't include the interact statement, I don't get any output. How do I get this to work so that I get the correct rsize value as the output?

Answer 1

Why not just use the output of ps?

$ ps -p <pid> -o rss | egrep '[0-9]' 

Remotely, you can do this over ssh:

$ ssh user@host ps -p <pid> -o rss | egrep '[0-9]' 

Answer 2

You can use any one of these methods, each has slightly different results.

expect -re "*\n" expect expect "%" 

You should also look at the meaning of match_max which controls how much will be matched.

after the results are caught, you will want to look the results

puts "$expect_out(buffer)" 

see http://en.wikipedia.org/wiki/Expect for some great examples.