10. Environment Variables

The following environment variables are processed by bc:

POSIXLY_CORRECT

This is the same as the -s option (see section Command Line Options).

BC_ENV_ARGS

This is another mechanism to get arguments to bc. The format is the same as the command line arguments. These arguments are processed first, so any files listed in the environent arguments are processed before any command line argument files. This allows the user to set up "standard" options and files to be processed at every invocation of bc. The files in the environment variables would typically contain function definitions for functions the user wants defined every time bc is run.

BC_LINE_LENGTH

This should be an integer specifing the number of characters in an output line for numbers. This includes the backslash and newline characters for long numbers.