writes the expressions expri in sequence, followed by a newline, to the specified output channel.


  • The output channel used by Write can be a single file or pipe, or a list of them, each specified as a string "name", as File["name"], or as an OutputStream object.
  • Write is a low-level Wolfram Language output function. Functions like Print and Message are defined in terms of it.
  • If any of the specified files or pipes are not already open, Write calls OpenWrite to open them.
  • Write does not close files and pipes after it finishes writing to them.
  • By default, Write generates output in the form specified by the setting of the FormatType option for the output stream used.


open allclose all

Basic Examples  (1)

Open a stream:

Write to the stream:

Close the stream:

Read the file:

Scope  (1)

Write an expression to the file specified by the File object:

Introduced in 1988
Updated in 2016