To unblock or delete an IP address listed in the iptables tables, follow these steps: Check the iptables rules for the IP address you want to unblock by running the following command: sudo iptables -L -n –line-numbers This will display a list of all iptables rules, along with their line numbers. Look for the rule … Read more
The pdfinfo command can be used in a UNIX / Linux shell prompt to display various information about a PDF file. Here are the steps to use pdfinfo: Open a terminal window and navigate to the directory containing the PDF file you want to inspect. Run the following command, replacing “filename.pdf” with the name of … Read more
To add an IPv6 network alias to a Red Hat or CentOS server, allowing multiple IPv6 addresses to be assigned to the same NIC (Network Interface Card), you can use the ip command. Here are the steps: Determine the name of the network interface to which you want to add the IPv6 address. You can … Read more
To mount a NAS (Network-Attached Storage) device via SMB/CIFS in FreeBSD, you can use the mount_smbfs command. Here are the steps: Install the Samba client software if it is not already installed: pkg install net/samba44 Create a mount point for the NAS share: mkdir /mnt/nas Mount the NAS share using the mount_smbfs command, specifying the … Read more
In Bash, you can clear the DNS cache by flushing the system resolver cache. Here are the steps to clear the DNS cache in Bash: Open a terminal window and type the following command to clear the cache: sudo systemd-resolve –flush-caches This command will flush the DNS cache and any other caches that may be … Read more
The realpath command in Linux can be used to find the absolute pathname for a given command or file. Here’s an example: $ realpath /usr/bin/python /usr/bin/python In this example, we’re using realpath to find the absolute pathname for the python command located in the /usr/bin directory. The output shows that the absolute pathname for this … Read more
A protective leather shell for a MacBook or MacBook Pro is a type of cover that is designed to protect the device from scratches, dings, and other types of damage that can occur during everyday use. These shells are typically made from high-quality leather that is durable and resistant to wear and tear. A leather … Read more
To run or call a shell script from AppleScript, you can use the do shell script command. Here’s an example: set myScriptPath to “/path/to/my/script.sh” do shell script myScriptPath In this example, the myScriptPath variable contains the path to the shell script that you want to run. The do shell script command then executes the script. … Read more
Transaction Signatures (TSIG) is a method of authenticating DNS messages between servers, allowing for secure communication and transfer of DNS zones. Here’s how you can configure TSIG on a BIND DNS server: Generate a shared secret key that will be used to authenticate DNS messages. You can use a tool like dnssec-keygen to generate the … Read more
To rename a file in Bash, you can use the mv command, which is used to move and rename files. Here’s the basic syntax: mv old_filename new_filename For example, to rename a file named “file.txt” to “new_file.txt”, you can use the following command: mv file.txt new_file.txt This will rename the file “file.txt” to “new_file.txt” in … Read more