In Linux, the noatime option can be used to disable the access time updates on a file system. This can improve the performance of the file system by reducing the number of disk writes required when files are accessed. To disable access time updates on the /var file system, you can follow these steps: Open … Read more

To restart the Apache web server on a Mac OS X system, you can use the apachectl command. Here are the steps to restart Apache: Open the Terminal application, which is located in the Utilities folder within the Applications folder. Type the following command to stop the Apache web server: sudo apachectl stop Note that … Read more

To start, stop, or restart the Postfix mail server on a Linux system, you can use the systemctl command if your system uses systemd as the init system. Here are the commands you can use: To start Postfix, run the following command: systemctl start postfix To stop Postfix, run the following command: systemctl stop postfix … Read more

The nslookup command is used to perform forward DNS lookups, meaning it resolves hostnames to IP addresses. To perform a reverse DNS lookup, which resolves IP addresses to hostnames, you can use the host command instead. The host command can perform both forward and reverse DNS lookups. To perform a reverse DNS lookup, simply provide … Read more

To see the file systems in Linux, you can use the df (disk free) command. The df command displays information about the file system disk space usage. By default, df displays the file system disk space usage in blocks, with the sizes rounded to the nearest 1K block. To display the disk space usage in … Read more

To renew DHCP lease on Ubuntu Linux, you can use the following steps: Open a terminal window. Run the following command to release the current DHCP lease: sudo dhclient -r Run the following command to renew the DHCP lease: sudo dhclient If the renewal is successful, you should see output similar to the following: Listening … Read more

To configure Tata Indicom Photon+ mobile broadband on Linux, you can use the following steps: Insert the Photon+ USB modem into your computer’s USB port. Open a terminal window and run the following command to install the wvdial package, which is a utility for setting up dial-up connections on Linux: sudo apt-get install wvdial Once … Read more

To display the current date in Bash, you can use the date command. Simply run the following command in a Bash terminal: date This will display the current date and time in the default format, which is determined by the system’s locale settings. If you want to display the date in a specific format, you … Read more

To turn off SELinux using the command line, you can use the following steps: Log in to the system as the root user. Edit the /etc/selinux/config file using a text editor such as vi or nano: vi /etc/selinux/config Change the SELINUX parameter to disabled: SELINUX=disabled Save and close the file. Reboot the system to apply … Read more

To change the password for the root user or any other user on OpenBSD, you can use the passwd command. To change the password for the root user, you can run the following command as the root user: passwd You will be prompted to enter the new password twice. Note that when you type your … Read more