Author: Unknown
Subject: seg_bg answer
Date: Thursday, 03 Dec 2020, 23:57:55

The following is never possible, because A (a simple) could not have a child. There needs to be a "connector) - &&, || , &, ...      

             &
            /  \
           A    B
          /  \      
         C    D
             /  \
             E   F


But (understanding your point), lets say you had 

              &
            /  \
          PIPE    C
          / \
         A   B

Then the entire PIPE gets backgrounded. Another example: In the case of:

              &
            /  \
           ;    C
          / \
         A   B

Then only B gets backgrounded. This is also true if B itself is a pipeline, a subcmd, or anything else. I.E.

              &
            /  \
          ;     D
          / \
         A   PIPE
              /\
             B  C

In the above, the entire PIPE gets backgrounded.