variable from remote script to local script

SuKHI · 10-20-2015, 12:55 AM

Hi,

I have written a script for memory management at remote machine.
Scenario is like:
1. SSH will read details from prop file of server to connect.
2. Then set node variable in script.
3. scp the script to remote machine.
4. Run memory management commands on remote machine.
5. send back the variable to local machine with memory info in integer.
6. I will pass the info to script to create files based on the integer provided.

I'm successful doing this above steps at local machine.
My problem is with passing the calculated memory as variable back to local machine. So my issue made me stuck at point 5.

how i can pass the variable back to script in the same session or same running shell.

Thanks...

chrism01 · 10-20-2015, 12:59 AM

Please show us your code so far - there are many possible solns.

SuKHI · 10-20-2015, 01:13 AM

Here it is:

Code:

sshpass -p 'password' scp /usr/tst/server1/meminfo.sh user@host:/tmp/server2
sshpass -p 'password' ssh user@host 'bash -s' < /usr/tmp/server2/meminfo.sh

#Want to expect the output from meminfo.sh from remote machine here
#what I thoughtt here to save in file and read the file for further steps.
#but i want to receive that information as variable here. like
var=<integer from remote>

further code to create empty files based on the var value
end

SuKHI · 10-20-2015, 01:16 AM

Do i need to put some logic in meminfo to get the variable set or changes with local script?

SuKHI · 10-20-2015, 01:21 AM

I think I just thought a solution :
correct me if wrong:
var=$(sshpass -p 'password' ssh user@host 'bash -s' < /usr/tmp/server2/meminfo.sh)

echo $var

Hope its right way to do

THanks

chrism01 · 10-20-2015, 01:29 AM

Looks about right, (I don't have sshpass installed), BUT I would highly recommend using ssh-keys instead of passwds for scripts.

SuKHI · 10-20-2015, 01:34 AM

I will go finally with ssh-keys only. this is right now for testing only.

chrism01: Is there any way I can pass variable from remote meminfo.sh script back to local script.
means I'll calculate memory in remote script setting as a variable n then sending back the variable value back to local. instead of using this new variable and putting ssh under it?

chrism01 · 10-20-2015, 06:53 PM

Here's a quick 'n dirty test I ran

Code:

# A=$(ssh vm4 ./t.sh)
# echo $A
VALUE

& 'VALUE' is the o/p of the remote test script

Code:

echo VALUE

HTH