To monitor all traffic on eth1 except for your own SSH session using tcpdump, you can use the following command: sudo tcpdump -i eth1 not port 22 and not src <your IP address> and not dst <your IP address> Here’s what each part of the command does: sudo tcpdump: Run tcpdump with superuser privileges. -i … Read more
In UNIX-based operating systems (such as Linux and macOS), you can set environment variables using the “export” command. An environment variable is a dynamic value that can be accessed by programs and scripts running in the shell session. To set an environment variable, follow these steps: Open a terminal or shell session. Type “export” followed … Read more
To save a file in Vi or Vim text editor, you can follow these steps: Press the Esc key to enter the command mode in Vi or Vim. Type “:w” followed by a space and then the filename to save the file under that name. For example, to save the file as “myfile.txt”, you would … Read more
The error message you are seeing indicates that the MySQL server is not able to recognize the “thread_concurrency” variable that is set to a value of 8 in the configuration file. The “thread_concurrency” variable was used in older versions of MySQL to control the number of threads that are used to process queries. To resolve … Read more
In Unix/Linux, you can use the “kill” command to terminate a running process or job. To kill all your jobs under the current shell session, you can use the following steps: Open a terminal and list all your running jobs by typing: jobs This will display a list of all the jobs that are currently … Read more
In Linux, the “faillog” command is used to display and manage records of login failures. The faillog command reads and displays information from the file /var/log/faillog, which stores the information about failed login attempts. Here’s how to use the faillog command to display records of login failure: Open a terminal and log in as root … Read more
In Bash shell, you can append the current date to a filename using the “date” command and command substitution. Here’s how to do it: Use the “date” command to generate the current date in a specific format. For example, to generate the current date in the “YYYY-MM-DD” format: date +%Y-%m-%d This will output the current … Read more
In Bash shell, you can generate random numbers using the built-in “RANDOM” variable or the “shuf” command. Here’s how to do it: Using the RANDOM variable: Use the “$RANDOM” variable to generate a random number between 0 and 32767: echo $RANDOM This will output a random number each time you run the command. Use the … Read more
In Linux or UNIX, you can run multiple X sessions (graphical sessions) simultaneously by using different virtual terminals (VTs). Here’s how to do it: Press “Ctrl + Alt + F2” (or any other function key from F2 to F7) to switch to the second virtual terminal. This opens a new login prompt. Log in with … Read more
To display only today’s files in Linux or UNIX, you can use the “find” command with the “-daystart” and “-ctime” options. Here’s how to do it: find /path/to/files -daystart -ctime 0 This command searches for files in the specified directory (/path/to/files in the example) that were created or modified within the last 24 hours. The … Read more