On occasion /dev/null on one of my virtual servers goes bad. It becomes:

-rw-r--r--  root root

Which causes all kinds of horrible issues, The quick correction for this is to re-create the device. This should work on most environments including native, OpenVZ, Parallels (Virtuozza), etc.).

sudo rm /dev/null
sudo mknod /dev/null c 1 3
sudo chmod 0666 /dev/null

If all worked correctly then /dev/null will be (as seen with ls -la /dev/null):

crw-rw-rw-  1 root root 1, 3 

I have not found out why this is happening. ... Click to read more

I often need to run multiple browser sessions simultaneously where each session is isolated from the other.

  • Testing a web page design for multiple logins (Admin, registered, privileged, etc. users)
  • Running a page that tends to crash FireFox (like Flash pages).

Under Linux (Ubuntu in this example) you can do this one of two ways:

1. Create a new user, open a terminal and ssh to that account and firefiox &. This creates a fully isolated session but is a bit tedious.

  • This is the best method for 100% isolation.

2. Create multiple Firefox profiles. ... Click to read more