Search code examples
shellunixbackground-processfile-descriptor

What does &p refer to?

I am not able to figure out what does &p do in the below script. and does print -u4 mean that whatever argument passed is written in file decriptor 4? 

1:  $SRVRMGRCMD |&
3:  BGPID=$!
4:  exec 4>&p
5:  exec 5<&p
6:  sleep 2
7:  # Build a list of Servers
8:  print -u4 "list servers show SBLSRVR_NAME"

Thanks in advance.

Solution

  • These appear to be references to co-processes (in ksh or zsh).
    see https://unix.stackexchange.com/questions/86270/how-do-you-use-the-command-coproc-in-bash