Closes a file opened with the OPEN command and deassigns the
    associated logical name.

    Format

      CLOSE  logical-name[:]

1  –  Parameter

 logical-name[:]

    Specifies the logical name assigned to the file when it was
    opened with the OPEN command.

2  –  Qualifiers

2.1    /DISPOSITION

       /DISPOSITION=option

    Specifies what action to take when the file is closed. The
    options are:

    DELETE          Delete the file.

    KEEP            Keep the file.
    (default)

    PRINT           Print the file.

    SUBMIT          Submit the file.

2.2    /ERROR

       /ERROR=label

    Specifies a label in the command procedure to receive control
    if the close operation results in an error. Overrides any ON
    condition action specified. If an error occurs and the target
    label is successfully given control, the global symbol $STATUS
    retains the code for the error that caused the error path to be
    taken.

2.3    /LOG

       /LOG (default)
       /NOLOG

    Generates a warning message when you attempt to close a file that
    was not opened by DCL. If you specify the /ERROR qualifier, the
    /LOG qualifier has no effect. If the file has not been opened by
    DCL, the error branch is taken and no message is displayed.

3  –  Examples

    1.$ OPEN/READ INPUT_FILE   TEST.DAT
      $ READ_LOOP:
      $ READ/END_OF_FILE=NO_MORE  INPUT_FILE  DATA_LINE
         .
         .
         .
      $ GOTO READ_LOOP
      $ NO_MORE:
      $ CLOSE INPUT_FILE

      The OPEN command in this example opens the file TEST.DAT and
      assigns it the logical name of INPUT_FILE. The /END_OF_FILE
      qualifier on the READ command requests that, when the end-of-
      file (EOF) is reached, the command interpreter should transfer
      control to the line at the label NO_MORE. The CLOSE command
      closes the input file.

    2.$ @READFILE
 <Ctrl/Y>

      $ STOP
      $ SHOW LOGICAL/PROCESS
         .
         .
         .
        "INFILE" = "_DB1"
        "OUTFILE" = "_DB1"
      $ CLOSE INFILE
      $ CLOSE OUTFILE

      In this example, pressing Ctrl/Y interrupts the execution of
      the command procedure READFILE.COM. Then, the STOP command
      stops the procedure. The SHOW LOGICAL/PROCESS command displays
      the names that currently exist in the process logical name
      table. Among the names listed are the logical names INFILE
      and OUTFILE, assigned by OPEN commands in the procedure
      READFILE.COM.

      The CLOSE commands close these files and deassign the logical
      names.