I actually want to know both these things since shells behave differently based on whether they are login or non-login, and/or interactive, non-interactive. See the following from the bash man page for an example (bash 3.2): 

       When bash is invoked as an interactive login shell, or as a non
+-interactive shell with the --login option, it first reads and  execu
+tes
       commands  from  the  file /etc/profile, if that file exists.  A
+fter reading that file, it looks for ~/.bash_profile, ~/.bash_login, 
+and
       ~/.profile, in that order, and reads and executes commands from
+ the first one that exists and is readable.  The --noprofile option  
+may
       be used when the shell is started to inhibit this behavior.

       When  a  login  shell  exits,  bash  reads  and executes comman
+ds from the files ~/.bash_logout and /etc/bash.bash_logout, if the fi
+les
       exists.

       When an interactive shell that is not a login shell is started,
+ bash reads and executes commands from ~/.bashrc, if that  file  exis
+ts.
       This  may  be  inhibited  by  using the --norc option.  The --r
+cfile file option will force bash to read and execute commands from f
+ile
       instead of ~/.bashrc.

       When bash is started non-interactively, to run a shell script, 
+for example, it looks for the  variable  BASH_ENV  in  the  environme
+nt,
       expands  its  value if it appears there, and uses the expanded 
+value as the name of a file to read and execute.  Bash behaves as if 
+the
       following command were executed:
              if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi
       but the value of the PATH variable is not used to search for th
+e file name.

[download]

So your link is useful for solving the interactive, non-interactive part of the puzzle, but I'm still keen to know how to solve the login/non-login part of the puzzle.

Thanks for the link.

In reply to Re^2: How do I test if my Perl script was run using a login vs a non-login shell by paulski82
in thread How do I test if my Perl script was run using a login vs a non-login shell by paulski82

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