aaron

Configuring the subversion server

I didn’t realize it before, but the subversion server running without tunneling over ssh doesn’t actually send the password in the clear when authenticating users. From the subversion book: At the time of writing, the server only knows how to send a CRAM-MD5 authentication challenge. In essence, the server sends a bit of data to the client. The client uses the MD5 hash algorithm to create a...

aaron

System information from linux command line

I was just reading this webpage about shell scripting, and discovered that you can get a lot of information about your cpu and memory from the command line. Return details about your processor: # cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 6 model : 8 model name : AMD Athlon(tm) XP 2700+ stepping : 1 cpu MHz : 2164.892 cache size ...

aaron

problems when unmounting filesystems in linux

I’m reconfiguring my RAID 5 array in one of my servers (called malachite), and having some problems doing so. What I’m trying to do is to completely delete the current RAID 5 array, and rebuild it with different sized partitions on the same disks. I can’t unmount the raid array directly, because linux reports back to me: # umount /raid umount: /raid: device is busy So I’m trying...

aaron

Reduce the number of multiplications required for the product of two polynomials

This was a problem done in my CIS 315 Algorithms class in Spring 2006. The product of two linear polynomials ax+b and cx+d [tex]\LARGE (ax+b)(cx+d)[/tex] is [tex]\LARGE acx^2 + (ad+bc)x + bd[/tex] Note that this requires 4 different multiplications of the coefficients: ac, ad, bc and bd. We want to find a way to determine this product with only 3 multiplications. let: L = (a+b)(c+d) note what...

aaron

Installing majordomo mailing list manager

First, I downloaded the Majordomo source code from here. Following the instructions in the included INSTALL file, I was able to get Majordomo installed relatively quickly. I ran into problems when I started trying to actually send email to the new list. The first problem I ran into was that sendmail wasn’t started, but that was just silly. The first real problem was something they actually...