csh pipe std err to an other pro.

From: Bash FAQ

D5) How can I pipe standard output and standard error from one command to
    another, like csh does with `|&'?

Use
        command 2>&1 | command2
The key is to remember that piping is performed before redirection, so
file descriptor 1 points to the pipe when it is duplicated onto file
descriptor 2.

From Csh man page:
       Diagnostic output may be directed through a pipe with the standard out-
       put.  Simply use the form `|&' rather than just `|'.

       The  shell  cannot  presently  redirect  diagnostic output without also
       redirecting standard output, but `(command  >  output-file)  >&  error-
       file'  is often an acceptable workaround.  Either output-file or error-
       file may be `/dev/tty' to send output to the terminal.

原来csh用 |& 一直不知道。