In Unix-like operating systems, the date and time can be set using the date command. To set the date and time, you need to have superuser privileges. Here’s the basic syntax for setting the date and time using the date command: sudo date –set=”YYYY-MM-DD HH:MM:SS” Replace YYYY-MM-DD with the desired year, month, and day, and … Read more

The mv command is used to rename files in Linux. The basic syntax is: mv [existing_file_name] [new_file_name] For example, to rename the file oldfile.txt to newfile.txt, you would run the following command: mv oldfile.txt newfile.txt Note that the mv command can also be used to move files from one directory to another. In this case, … Read more

To add a user to the www-data group (Apache group) in Ubuntu, you can use the following steps: Open a terminal window. Use the adduser command to add the user to the www-data group: sudo adduser [username] www-data Replace [username] with the actual username of the user you want to add to the group. Log … Read more

To mount a CD-ROM in Linux, you need to perform the following steps: Insert the CD-ROM into your CD/DVD drive. Create a mount point directory, which is the directory where the CD-ROM will be accessible. For example: mkdir /mnt/cdrom Use the mount command to mount the CD-ROM. For example: mount /dev/cdrom /mnt/cdrom Note that /dev/cdrom … Read more

The export command is used in Linux/Unix to set environment variables, which are used to store values that can be referenced in various shell commands and scripts. To set an environment variable using export, simply type the following in your terminal: export VARNAME=value Replace VARNAME with the name of the environment variable, and value with … Read more

To show the version of Gnome on an Ubuntu Linux system, you can use the following command: gnome-shell –version This will display the version number of the Gnome shell, which is the graphical user interface component of the Gnome desktop environment. For example: GNOME Shell 3.38.2 Alternatively, you can also use the lsb_release command to … Read more

If the ifconfig command does not show the IPv4 address on your Linux system, there are several potential reasons for this: The network interface is down: Try running the following command to bring up the network interface: sudo ifconfig <interface> up Replace <interface> with the name of the network interface, for example eth0. The network … Read more

The semanage command is part of the SELinux management tools package, which is not installed by default on Red Hat Enterprise Linux (RHEL) 6/7/8 systems. To install it, you need to run the following command as root or with sudo privileges: yum install policycoreutils-python After the installation, you should be able to run the semanage … Read more

To change the OpenSSH port on Red Hat Enterprise Linux 6 (RHEL 6) with SELinux enabled, you need to perform the following steps: Edit the OpenSSH configuration file: sudo vi /etc/ssh/sshd_config Find the line that starts with Port and change it to the desired port number. In this case, you want to change it to … Read more

The error message “/usr/bin/ld: cannot find -lc” usually occurs when the linker is unable to find the standard C library libc.so while compiling a program. This can happen if the library is not installed on your system or if the linker is not able to find it in the default library search path. To resolve … Read more