Command Line Arguments of FORTRAN

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Command Line Arguments

A FORTRAN program can easily evaluate arguments included on the command line that runs the program. A couple of examples follow.

• The IARGC function returns the number of command line arguments:

N = IARGC ()

Sets N to the number of command line arguments

• The GETARG subprogram returns the value of a specified argument:

CALL GETARG(I , STR)

Puts the I'th argument into string STR

Environment Variables

The GETENV subprogram provides the values of environment variables. For example, to copy the value of variable MY_OUT into string OUTFILE, include in your source file:

CALL GETENV ( 'MY_OUT' , OUTFILE )

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