Unable to Execute Multiple Alias Commands

I'm encountering an issue where I'm unable to execute multiple alias commands at the same time in my shell environment. For example, when I try to run two alias commands together, only one seems to execute, or I get an error. The below example shows that what I am exactly trying If I want to copy file.txt from one system another system, we scp command. So, i was trying scp -i auth_key file.txt userid@target_hostname:/target/path/ alias1= 'scp -i auth_key' alias2= 'userid@target_hostname:/target/path/' I was trying to execute the below command alias1 file.txt $alias2