I usually forgot this simple command so I've decided to write down some notes on it so I can cut 'n' paste from here easily, here's another common question:
"How to swap stdout and stderr descriptors ?"
This enables your scripts to parse stderr and forget stdout (or redirect it to a file)
command <parameters> 3>&1 1>/dev/null 2>&3-
Here's what it does:
Moves stdout to /dev/null (or your preferred file if needed).
Moves stderr to file descriptor (3)
Moves file descriptor (3) (containing stderr) to stdout (real stdout, not null!)
This is what I use to parse errors with my scripts when I got something bad from external programs
Glad to see comments