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4.9.6 Pipe links

Pipe links provide acces to stdin and stdout of any program. Pipe links are bidirectional. Syntax: "|: " + string_for_system

The string_for system will be passed to system after conneting the input and output to the corresponding stdout and stdin.

Example:

 
  link l="|: date";
  open(l); l;
==> // type : pipe
==> // mode : 
==> // name : date
==> // open : yes
==> // read : not ready
==> // write: ready
  read(l);
==> Fr 15. Feb 09:18:06  2019
  l;
==> // type : pipe
==> // mode : 
==> // name : date
==> // open : yes
==> // read : not ready
==> // write: ready
  close(l);