Environment variables are not working for non-interactive shells.

Issue

• Defining environment variables in ~/.kshrc for a user with ksh as the login shell works on an interactive shell:

  [root@server ~]# su - user
  Last login: Fri Dec 20 11:08:13 CET 2024 on pts/1
  $ whoami
  user
  $ echo $SHELL
  /usr/bin/ksh
  $ tail -n2 ~/.kshrc    
  # User specific aliases and functions
  export VAR=/opt
  $ echo $VAR
  /opt
  $ 
  

• However the same fails when using su - <USER> -c instead:

  [root@server ~]# su - svchpsuat -c "echo $VAR"
  
  [root@server ~]# 
  

• The same behaviour applies to bash and ~/.bashrc