DumpSave
 Usage
• DumpSave["file.mx", symbol] writes definitions associated with a symbol to a file in internal Mathematica format.
• DumpSave["file.mx", "context`"] writes out definitions associated with all symbols in the specified context.
• DumpSave["file.mx", { ,  , ... }] writes out definitions for several symbols or contexts.
• DumpSave["package`", objects] chooses the name of the output file based on the computer system used.
Notes
• DumpSave writes out definitions in a binary format that is optimized for input by Mathematica. • Each file has a plain text header identifying its type and contents. • Files written by DumpSave can be read by Get. • Files written by DumpSave can only be read on the same type of computer system on which they were written. • DumpSave will not preserve open stream and link objects. • Files written by DumpSave conventionally have names that end with .mx. • DumpSave["package`", ... ] writes a file with a name such as package.mx/$SystemID/package.mx. • You can use DumpSave["file", "s"] to write out the definition for the value of a symbol s itself. • You can typically read a dump file when you start Mathematica by using the initfile command-line option. • New in Version 3.
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