The Shaarei Taamei HaMitzvos says that the reason Tzitzis is white is since white is the color of Selicha, Kapara, and Rachamim.

See Machzor Vitri.

Do tzitzit have to be white?
I have a program I need to run at startup, it has output on stdout and stderr that I want to redirect to the system log using the logger command.  What I have in my startup script is thie:


/home/dirname/application_name -v|logger 2>&1 &


This is redirecting the stdout to syslog just fine but stderr is coming to the console, so I need some help on refining the command.
