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Learn how to easily find the MAC address of any device on your Linux network. Follow our guide to look up MAC addresses and gather device info quickly.

To create a user with a different home directory in Linux, we can use the “d” option of the useradd command as performed in this article.

Multiple methods are used to do a port scan in Linux, which are nmap, netcat, ss, netstat, lsof, and telnet commands. All these are practically demonstrated here.

To change the SFTP port in Linux, use the given command for setting the rules, change the port in the “ssh_config” file and restart the ssh service.

The SSH default port is changed due to security reasons, and to change it, edit the ssh configuration file “/etc/ssh/sshd_config” or run the “sed” command.

We can find the UUID of the storage devices in Linux using the “blkid”, “lsblk”, “/dev/disk/by-uuid” and “/etc/fstab” methods as discussed in this article.

In Linux, to change the ssh port, update the firewall setting, change the port number in the “ssh_config” file, and restart the ssh service.

To find the cron or the crontab log in the UNIX operating system, use the command “grep CRON /var/log/syslog” command-line interface.

To check crontab services, “status” utility, “ps aux”, “pgrep”, and “tail” commands are used. It provides currently active/dead running processes in the system.

The /etc/passwd file holds the information of “Username”, “Password”, “UID”, “GID”, “GECOS”, “Home directory”, and “Login shell” of the system and normal users.

This error occurs when the root user account is not set up correctly. To fix the error, set the root user password for MySQL and log in again.

The “usermod” command is used to change the attributes of the existing user of the system. Moreover, it needs the root user privileges to apply the new changes.

To find the process id, use the commands “pidof”, “pgrep”, “pstree”, or “ps aux”. And to kill it, use the “killall , or “kill -9 ”.

The error “waiting for cache lock ubuntu var/lib/dpkg/lock-frontend” occurs due to the involvement of the dpkg package manager in another running process.

In Linux, the User ID (UID) stores all the user’s information which can be used with different commands like id, cat, getent, and awk to find users information.

To find any Linux file with an extension in Linux, “find”, “locate”, and “grep” commands are used, which search the files from the PWD or the specified location.

The “ssh connection refused port 22” error can be resolved by installing “OpenSSH” packages or checking the active status of SSH services or port numbers.

To count the lines in a Linux file, different methods are used, like, wc (word count), grep, sed, awk, nl (number of lines), and perl commands.

To resolve the “x11 Connection Rejected Because of Wrong Authentication” error, enable the x11 Forwarding or add correct authorization key to Xauthority file.

Threads provide an execution path within the process that can be found using the “lscpu” command in the terminal. Read this article for more details.

A docker is an open-source application managing platform where users can be added to the docker group using the “sudo usermod -aG docker user-name” command.

To list users in Linux, run the “cat /etc/passwd” command. Use “cat /etc/passwd | cut -d: -f1”, and “awk -F: ‘{ print $1}’ /etc/passwd” commands for user names.

The error “ java Command not found” in Linux can be removed by installing the missing required package (JRE or java) and updating the PATH variable manually

To create a normal group in Linux, use the “sudo groupadd ” command, and for creating a system group, use the “sudo -r groupadd ” command

The version of log4j can be checked in Linux using the “sudo find / -name ‘log4j*’”, “sudo apt list -a liblog4j2-java” and “dpkg -l | grep liblog4j” commands

In Linux, to find the CPU information like CPU architecture, Number of CPUs, use lscpu, /proc/cpu, dmidecode, inxi tool, lshw, top, hardinfo, and nproc commands

To list the groups in Linux, use the “groups”, “/etc/group”, “id”, and “getent” commands. This guide serves extensive approaches to list groups in Linux.

3 of the most common ways to check the Linux kernel version in the command line are by using the “uname”, “cat /proc/version”, and “hostnamectl” commands

Run the command “systemctl list-units –type=service –state=running” or “service –status-all | grep ‘\[ + \]’” to check the running service on Linux.

The “Could not open lock file /var/lib/dpkg/lock-frontend” error is caused by not having root user access, or another process is occupying the package manager.

The “No space left on device” occurs due to corrupted blocks or deleted files taking up space. This is fixed by a daemon-reload or the e2fsck command.

The “docker no space left on device” error occurs when space runs out on the system. This is resolved by pruning the system or volumes, completely or manually.

To understand the method by which we can add the users in the group Linux, … Read More