Two-way pipes combine the functions of input and output pipes. To use a two-way pipe, the filename must consist of the pipe symbol (|) followed by the name of the command. The file should be opened for input-output i-o.
select i-o-file assign to "| cmd /c sort" organization is line sequential. fd i-o-file. 01 i-o-file-record pic x(20). procedure division. open i-o i-o-file write i-o-file-record from "Hello world" write i-o-file-record from all "A" write i-o-file-record from all "Z" write i-o-file-record from x"1a" perform until exit read i-o-file at end exit perform end-read display i-o-file-record end-perform close i-o-file
In this example, the program launches the sort process and passes it three lines of text, followed by an end-of-file marker. The program then reads all three lines back from the standard output of the sort process.