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Expect help needed .. can i do this ?

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# 8  
Old 04-19-2013
I don't actually see anything wrong with that, in what way did it not work?

Did the text just go directly to the screen? Maybe it prints to standard error instead of standard output. That's usually reserved for error messages but sometimes you want to catch its output too, and you can:

Code:
VAR=$( command 2>&1 )

# 9  
Old 04-19-2013
can't read "( ./getcpu )": no such variable
while executing
"CPU="$( ./getcpu )""
(file "./test.sh" line 12)


---------- Post updated at 04:28 PM ---------- Previous update was at 04:28 PM ----------


ls getcpu
getcpu

# 10  
Old 04-19-2013
You are running this in BASH, yes? You asked for BASH...
# 11  
Old 04-19-2013
sorry if i misled you

what i have is an expect script that needs to do what i originaly posted
but in the expect script i need to call a bash script ( which gets me the current cpu )
that is called getcpu .. i need to evaluate the value returned by the getcpu script

hope i am clear ?
please ask if not and i will post the script
# 12  
Old 04-19-2013
Apologies for misunderstanding. I thought you were using expect to extract information for BASH, not vice versa.

Unless it's doing something picky and interactive like automatic telnet logins, I'm not sure what you're using expect for; it's meant to automate interactive things, to the point it comes with autoexpect -- a tool that generates expect programs, just from watching what you type when you run something. For general scripting, expect's it's not so great.

Please post your code, certainly.
# 13  
Old 04-20-2013
corona ,
funnily enough thats exactly what i am trying to do ..automate the manual process
i run a server which spikes the cpu to 100%
but you can reduce it by setting a value
which can be gotten using a command
so my expect script "should " loolk like this

Code:
#!/usr/bin/expect -f
spawn telnet server port
expect "started"
send "get value server"
// this when i get the response back , and i need to find the lines , returned with a * in the beginning
cpu=getcpu 
while  cpu > 90 
do
send "value1 "
done


once it gets the correct value applied , the cpu drops to 10-15 %
which is what i need to be done via an expect script , i can do it manually like i said

thanx


this is the code for my gecpu
Code:
#!/bin/bash
read cpu a b c previdle rest < /proc/stat
prevtotal=$((a+b+c+previdle))
sleep 0.5
read cpu a b c idle rest < /proc/stat
total=$((a+b+c+idle))
CPU=$((100*( (total-prevtotal) - (idle-previdle) ) / (total-prevtotal) ))
echo $CPU
exit $CPU

Last edited by Corona688; 04-22-2013 at 04:33 PM..
# 14  
Old 04-28-2013
Sorry to bump this , its been a week
can anyone help ?
all i am trying to find out is
in an expect script
how can i store the value returned by another ( bash) script

i want to call the bash script using system or exec and evaluate the response and send some other commands based on that


PLEASE help

---------- Post updated at 06:12 AM ---------- Previous update was at 06:06 AM ----------

Got it Smilie
man just needed to google correctly
Code:
set variable [ exec cmd ]

Last edited by Franklin52; 05-01-2013 at 03:37 AM..
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