CODEWITHSUNDEEP
fortranenvironment-variablesgfortranintrinsics
Taylor
Taylor

Reputation: 59

Fortran get_environment_variable intrinsic returns nothing

I know that Fortran 2003 contains the intrinsic subroutine get_environment_variable, but I can't get it to return the variable I want. Here is a test program:

program main
  implicit none
  character(len=10) :: time

  call get_environment_variable("t", time)
  write(6,*) time
end program main

I then set t=2010010100 (or something) in the shell, compile and run, and the only thing written is a blank line. I don't understand: I'm using gfortran with the flag -std=f2003, this should be simple, what's being hung up? I suspect it's quite simple and the answer will expose my ignorance....but thank you anyways!

Upvotes: 1

Views: 910

Answers (1)

Phil Hasnip
Phil Hasnip

Reputation: 11

In bash you need to export the environment variable, otherwise it won't be passed to the program.

PS you do this using the "export" command, e.g. 

export t=2010010100

Upvotes: 1

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