How to read STDERR messages from a third party program?

[Arne Goetje]

Hi,

I want my perl script to start a third party program (daemon) in the
background and capture the messages it sends out onto STDERR
occasionally.
These messages should be processed by my perl script.

Any idea how to do this?

Please CC to me. Thanx.

 

[Josef Möllers]

Hi,

I want my perl script to start a third party program (daemon) in the
background and capture the messages it sends out onto STDERR
occasionally.
These messages should be processed by my perl script.

Any idea how to do this?

If your daemon doen't do any output to stdout, you could just redirect
stderr to stdout:
open(DAEMON, "daemon 2>&1 |");

 

[fifo]

If your daemon doen't do any output to stdout, you could just redirect
stderr to stdout:
open(DAEMON, "daemon 2>&1 |");

Or if it does write to stdout, you can suppress this
with "daemon 2>&1 1>/dev/null |".

 

[Joe Smith]

background and capture the messages it sends out onto STDERR

That's an FAQ.

perldoc -q stderr

Look at IPC::Open3.