Files

• You can use FileNames[ ] to get the list of files in your current directory. SetDirectory[ ] can be used to change your current directory, and ResetDirectory[ ] can be used to change it back to the default.

• To write an expression to a file, you can use a command similar to expr >> file. The following example writes an expression to the file tmp.

  Expand[(a + b)^5] >> tmp

  .

• To append an expression to a file, you can use a command similar to expr >>> file. This example appends another expression to the file tmp.

  Factor[x^6 - 1] >>> tmp

• To receive the list of directories that Mathematica searches while attempting to find an external file, evaluate $Path. To add a directory to this list, try the following example.

  AppendTo[$Path, "directory"]

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