How to return the output of program in a variable?

Question

Can any one tell me how to return the output of a program in a variable from command line?

var = ./a.out params

I am trying to get the outp

Answer 1

For output from multi-line command, you can do this:

output=$(
#multiline multiple commands
)

Or:

output=$(bash <

Example:

#!/bin/bash
output="$(
./a.out params1
./a.out params2
echo etc..
)"
echo "$output"