Y may be a scalar or a simple vector of integer numbers in the range 0-255.

X is a simple numeric integer that specifies the output device.

• If X is positive or zero, it represents a file descriptor that must have been associated by the command that started Dyalog APL.
• If X is negative, it represents the tie number of a file opened by ⎕NTIE or ⎕NCREATE.

If Y is an empty vector, no codes are sent to the output device.

The shy result R is ⍬.

The operation will fail with a DOMAIN ERROR if Y contains anything other than numbers in the range 0-255, or if the current process does not have permission to write to the specified device.

Examples

Write ASCII digits '123' to stream 9:

      9 ⎕ARBOUT 49 50 51

Write ASCII characters 'ABC' to MYFILE:

     'MYFILE' ⎕NCREATE ¯1
      ¯1 ⎕ARBOUT 65 66 67

Append the string 'Κάλο Πάσχα' to the same file, and close it:

      ¯1 ⎕ARBOUT 'UTF-8' ⎕UCS'Κάλο Πάσχα' 
      ⎕NUNTIE ¯1