[How To?] Run shell script and get output into another shell.

[Thireus]

Hi guys,

 

I have a simple question, I want to store the output of the following command:

 

sudo iotop -t 0 -C 3 | grep "load: "

 

As you can see it is running all the time, and we get a new line every 3sec.

 

I just want to store these new lines into a single variable, so I can use it into a script.

 

To clear the screen, and do not print lines after the others when iotop is running just delete "- C".

 

I DO NOT WANT TO STORE THE OUTPUT ON THE DRIVE!!!

I DO NOT WANT TO KILL IOTOP, IT MUST BE RUNNING ALL THE TIME IN BACKGROUND!!!

 

The idea is to do not write on the drive! Just store the output into a single variable called $Activity.

 

For example:

 

Activity=$(sudo iotop -t 0 3 | grep "load: ") &

While $Activity... do blahblah... done

 

But the fact is that nothing can be stored into Activity

So I have tried to know if something can be done to read the last output of a specified PID. But I need help on that point too :-/ I don't know how to do it.

 

Please help...

[Thireus]

Ok, here is my code:

 

sudo iotop -t 0 -C 3 | grep "load: " | script.sh

 

script.sh:

 

#!/bin/sh

 while read data
 do
  echo "[$(date +"%D %T")] $data" >> log_activity.txt
 done

 

But nothing is read

[Thireus]

SOLVED!!!

 

...
iotop -t 0 -C 3 | grep "load: " --line-buffered |  while read data
do
echo "${data}"
#Do whatever you want with ${data} here :)
done
...