You said you use "sh shell". This can mean one of two things: a POSIX shell or a Bourne Shell. If it is a POSIX shell you can set the variable "ENV" pointing to some startup file. This would be...
It might be better placed in the shells startup code, that is: ~/.kshrc or ~/.bashrc, depending on which shell thread-o/p is using. Unlike the .profile, which is run every time a user logs in, the...