Re^2: Issue with communication of large data between Parent and child using Perl pipes

I looked for that the "-" modifier does in front of pipe symbol,

It's the 3-arg form of "command|"

open(my $pipe, "$command |")    # 2-arg form
open(my $pipe, '-|', $command)  # 3-arg form
[download]

"open()" does NOT return a PID

Actually, it does when using open to create a process and pipe. This is documented.

And it appears that -| and |- without further arguments simply forks without executing anything instead of giving an error or trying to launch a program named "-". This doesn't seem to be documented. [ Apparently it is, just not in open. See reply ]

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Re^3: Issue with communication of large data between Parent and child using Perl pipes by ig (Vicar) on Jul 17, 2009 at 21:52 UTC
This doesn't seem to be documented. It's documented in Safe Pipe Opens, with examples that might be helpful to the OP.	[reply]
Re^3: Issue with communication of large data between Parent and child using Perl pipes by Marshall (Canon) on Jul 17, 2009 at 22:04 UTC
Thanks! ikegami! `open(my $pipe, "$command \|") # 2-arg form open(my $pipe, '-\|', $command) # 3-arg form` [download] above looks right, this 2 arg form from OP looked weird to me: `$pid=open(PARENT_READ_HANDLE, "-\|");` [download] Which as they say is neither fish or fowl (not correct 2-arg or 3 arg). I am still a bit confused as to the OP's intent here. This still appears to be a synchronous app, not client-server. There is a lot of complex stuff that doesn't appear to be necessary.	[reply] [d/l] [select]