There are some subtle points that the blog is not clear about:

- The use of `1>&2` is to overwrite the stdout of the LHS process so that `echo green` actually never writes to the pipe, so it never gets SIGPIPE.

- `echo` only echoes arguments and always ignores stdin, so putting `echo blue` on the RHS of the pipe only serves to run the two sides of the pipe in parallel

- `bash -c '(echo green 1>&2) | echo blue' 1>stdout 2>stderr` will show you that green and blue actually write to different files

Another observation:

> if it was a separate command (or even if the shell forked to execute it internally), only the 'echo red' process would die from the SIGPIPE instead of the entire left side of the pipeline.

Most linux distributions have /bin/echo as a separate program. Running `(/bin/echo red; echo green 1>&2) | echo blue` will always print both green and blue.

EDIT: fix typo of stdin/stdout/stderr as suggested