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Lock files help to prevent multiple instances of a given operation (i.e. system command, script, batch file or application) from running at the same time.  This is specially important when you are going to cron something to execute automatically, which may take an extended period of time to complete or when it's a system/bandwidth intensive process.  With Linux, creating & utilizing lock files is very simple & straight forward. Read More...

Creating a symbolic link is easy, simply use this command: ln -s [source] [destination] Where: [source] is the absolute or relative path to the file or directory you are symbolic linking the pointer to. [destination] is ... Read More...

Use this command to obtain a list of YUM installed packages: yum list | grep installed > installed.txt ... Read More...

Use this command to backup all important system data: tar -pcvf /backup.tar /root /home /var /etc Review contents of backup with this command: tar -tvf backup.tar  Extract the files using this command: tar -pxf b... Read More...

If you run into a situation where the memory cache needs to be flushed, as root, run the commands below to syncronize changes in memory to hard disk & then clear the memory cache. sync; echo 3 | sudo tee /proc/sys/vm/dr... Read More...

If you have spent any amount of time researching how to perform backups on Linux systems, you will find there is a wide array of backup options available.  Many solutions require dedicated systems, special applications ... Read More...

There are a large number of command line tricks out there for Linux. These are some of the more special things I try to remember. Repeat the last command you just entered !! Repeat the last command you just entered thru ... Read More...

If you are using a later version of Fedora Linux (such as in Fedora 14), you will find that GUI login to 'root' is no longer allowed from the login screen.  It however is possible to re-enable this. You will either nee... Read More...

You will need to run these commands as 'root'. This command blocks IP "123.123.123.123" at the firewall. iptables -I INPUT -s 123.123.123.123 -j DROP This command lists all the IPs currently blocked at the firewall iptab... Read More...

If you setup a playlist and found that XMMS only plays a single song and then stops, there is a solution. After upgrading my pretty much vanilla installation to Fedora 16, I ran across this exact problem. There are 2 thing... Read More...