Archive for 'Linux Utilities'

Configuring wget to use a proxy server

Periodically I need to download files on servers that aren’t directly connected to the Internet. If the server has wget installed I will usually execute it passing it the URL of the resource I want to retrieve: $ wget If the system resides behind a proxy server the http_proxy variable needs to be set […]

Four super cool utilities that are part of the psmisc package

There are a ton of packages available for the various Linux distributions. Some of these packages aren’t as well know as others, though they contain some crazy awesome utilities. One package that fits into this cataegory is psmisc. Psmisc contains several tools that be used to print process statistics, look at file descriptor activity, see […]

Figuring out how long a Linux process has been alive

I’ve bumped into a few problems in the past where processes that were supposed to be short lived encountered an issue and never died. Over time these processes would build up and if it wasn’t for a cleanup task I developed the process table would have eventually filled up (the bug that caused this was […]

Dealing with xauth “error in locking authority file” errors

I recently logged into one of my servers and received the following error: $ ssh foo matty@foo’s password: Last login: Tue Nov 1 13:42:52 2011 from /usr/bin/xauth: error in locking authority file /home/matty/.Xauthority I haven’t seen this one before, but based on previous “locking issues” I’ve encountered in the past I ran strace against […]

Displaying CPU temperatures on Linux hosts

Intel and AMD keep coming out with bigger and faster CPUs. Each time I upgrade (I’m currently eyeing one of these) to a newer CPU it seems like the heat sinks and cooling fans have tripled in size (I ran across this first hand when I purchased a Zalman CPU cooler last year). If you […]

Using collectl on Linux to view system performance

I recently needed to figure out what process was generating a bunch of I/O requests on a Linux system. On Solaris, there are a ton of tools available in the DTraceToolkit that can pin down i/o performance consumers. I really miss DTrace coming into Linux. I know there’s Systemtap, but I personally haven’t had much […]

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