2. Invocation

DC may be invoked with the following command-line options:

‘-e expr’

‘--expression=expr’

Evaluate expr as DC commands.

‘-f file’

‘--file=file’

Read and evaluate DC commands from file.

‘-h’

‘--help’

Print a usage message summarizing the command-line options, then exit.

‘-V’

‘--version’

Print the version information for this program, then exit.

If any command-line parameters remain after processing the options, these parameters are interpreted as additional files whose contents are read and evaluated. A file name of - refers to the standard input stream. If no -e option was specified, and no files were specified, then the standard input will be read for commands to evaluate.