bash background process modify global variable

Question

I have a global var foo=\"some value\" and a background process back_func, I want to the background process to access $foo and modify its value, which can be seen by the mai

Answer 1

If the main process (let's call it main.sh) is another periodically running bash script then you could simply have the the other script (let's call it other.sh) write the value to a file (let's call this file value.sh).

other.sh

#! /bin/bash  
echo "SOME_VAR=42" > /tmp/value.sh

main.sh

#! /bin/bash  
. /tmp/value.sh  
# Now you can use SOME_VAR