Linux

As a Linux admin, you must have got a request for renaming a mount point. Well, it is fairly easy to rename the mount point name in Linux, but it needs some mount point. Note: You may have clustering software like Veritas Infoscale or PCS cluster which might be controlling the mount point configuration. This […]

The env command is used to run a command with modified environment variables. By supplying the name of a variable and a value in the key-value pair format, as well as supplying a command to run, you can change the value of the specified variable for that particular command session. If the variable does not […]

GNU zip (gzip) is a compression utility that reduces the size of selected files. Files compressed with gzip frequently have the .gz file extension. The gzip command has several options. These command options are described in the following table. Option Used To -d Reverse file compression (decompression). -f Force compression or decompression of a file […]

The dd command copies and converts files to enable them to be transferred from one type of media to another. The dd command has various operands, or actions, to perform. Operand Used To if={file name} Specify the file from which data will be read. of={file name} Specify the file to which data will be written. […]

The syslogd service is the original syslog service on Linux. The rsyslogd service makes several improvements, including support for: TCP instead of UDP as the transport protocol, increasing the reliability of transmitted data. Data encryption using SSL/TLS. Outputting data to various database technologies like MySQL. Buffering data on local systems when the remote receiver is […]

Linux often uses two particular utilities to help manage files. The first utility is tape archiver or tar. The second is a compression utility such as gzip. The purpose of tar is to bundle together multiple files into a single tarball with a .tar extension. This makes functions like downloads much easier since there is […]

The yum command improves the functionality of rpm while still using .rpm packages and maintaining an RPM database. It provides a more straightforward method for managing packages. One of the biggest benefits of YUM is the ability to automatically handle software dependencies. This means that administrators can tell YUM to install a particular package, along […]

It is possible to configure a Linux system to act as a router. The role of a router is to pass traffic from one network segment to another, based on the network ID of packets. In order to properly direct traffic to the appropriate subnet (and prevent traffic from getting to certain subnets, too), routing […]

The netstat (network statistics) command is used to gather information about TCP connections to the system. Depending on the options used, netstat informs the user of existing connections, listening ports on the server, NIC information, etc. Common options for the netstat command include: Option Used To -v Activate verbose mode. -i [interface] Display info about […]

One of the earliest parts of network troubleshooting is sending test packets between two systems. This is done using a TCP/IP utility called ping. The ping command will generate a response request from the sending computer and should receive a reply from the destination computer. Possible outcomes of the ping command include: Reply from [host]: […]