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  • Is the first line of your shell script a #! line, or a line that is just #, or something else? Commented Aug 5, 2015 at 17:36
  • it is actually sqlplus, a binary executable. when i type sqlplus, it is actually able to locate the executable. but it prompt me that some of the environment variables are not set properly - which leads me to think that the child process might need to access some public(env) variables, but again brought me to think - how does the child process even locate the executable in the 1st place ? does the child process run the executable or ? (which lead to this question) Commented Aug 5, 2015 at 17:52