This command takes a single file name as argument, and directs output to that file from then on, until another OUT changes the output file, or SHUT closes it.
Output can go to only one file at a time, although many can be open.
Any existing file is erased before its first use for output in a job, or if it had been SHUT before the new OUT . The output sent to the file will be in the same form that it would have on the terminal. If the purpose of the output file is to save results to be read in later, this is not an appropriate form. We first must turn off the NAT switch that specifies that output should be in standard mathematical notation.