There are a lot of wireless manager software available for Linux, some of the most common ones are:

NetworkManager, which is the default for Ubuntu
KwifiManager, which is the KDE's default one

I used to use wifi-radar, but now I am using wicd.

If you are running

polipo and run out of disk space you have two options, one is to reduce the space polipo is using in /var/cache/polipo/ thus, fine tunning cache server or to change the cache directory to its own partition. Here we will see this second option

ps, is a Linux command tool, that lets you view the current running processes, it is very useful when you are trying to kill a process or to view which applications other users are running (if you are the admin).

You may use it to check your own applications, some other user's application or a full list of the applications running on the operating system, you may also combine it with grep.

running it alone with no atributes

ps

I have been traveling the last two weeks, and I have found how useful is wifi-radar on my Linux powered laptop.

I have an IBM Thinkpad T30 with an Aironet Wifi internal card (for the records)

Introduction

iftop is a real good utility both for your own PC/Laptop and for your server and specially good for the latter and even better if this server is acting as the main router in your premises.

sysstat is a package of monitoring tools, these are the tools included in the package.

iostat

Reports CPU statistics and input/output statistics for devices, partitions and network filesystems.

mpstat

Reports individual or combined processor related statistics.

pidstat

Reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc.

sar

Collects, reports and saves system activity information (CPU, memory, disks, interrupts, network interfaces, TTY, kernel tables,etc.)

sadc

One important thing to check on your Linux box, is the CPU utilization, specially if usually compile software, or if you have server applications running on your PC.

One good tool to check this is: htop, which will show you a lot of useful information, the important data is the load average, that will show you if you are having processes waiting for the CPU or not.

How to assign and reassign priority to Linux commands or processes, to optimize your CPU ussage

You may have seen this problem with your Linux sometimes, you are working with your normal applications, like browsing the web, using Open Office or any other thing, and then Linux start a cron process or you start a make command, and all the other applications slow down.

Well you can solve that by entering different priorities to different applications, this is done with the nice and renice commands.