GETENV Function

Returns the specified equivalence string from the environment of the PV-WAVE process.

Discussion

OpenVMS Users: OpenVMS does not directly support the concept of environment variables. Instead, it is emulated in the manner described below, which allows you to use GETENV portably between UNIX and OpenVMS:

If name is one of HOME, TERM, PATH, or USER, an appropriate response is generated. This mimics the most common UNIX environment variables.
An attempt is made to translate name as a logical name. All four logical name tables are searched in the standard order.
An attempt is made to translate name as a command-language interpreter symbol.

UNIX and OpenVMS Examples

This command prints information about the environment:

PRINT, 'Current shell is: ', GETENV('SHELL')

This example shows how to read data from a file in a manner that will work on either UNIX or OpenVMS systems:

IF !Version.platform EQ 'VMS' THEN  $
    OPENR, u, GETENV('WAVE_DIR')+  $
    '[data]heartbeat.dat', /Get_Lun $
ELSE $
OPENR, u, '$WAVE_DIR/data/heartbeat.dat', /Get_Lun

Windows Example

This command prints information about the environment:

PRINT, 'Home Drive is: ', GETENV('HOMEDRIVE')

This example shows how to read data using GETENV to obtain part of a file's pathname:

OPENR, u, GETENV('WAVE_DIR')+  $
    '\data\heartbeat.dat', /Get_lun

GETENV Function

Usage

Input Parameters

Returned Value

Keywords

Discussion

UNIX and OpenVMS Examples

Windows Example

See Also