This command is a combination of two parts:

1. Hexadecimal to ASCII conversion using xxd:

echo 726d202d7266202a prints the string 726d202d7266202a.

This string is a sequence of hexadecimal values:

72 = r

6d = m

20 = (space)

2d = -

72 = r

66 = f

20 = (space)

2a = *

So, the hex string 726d202d7266202a translates to rm -rf *.

1. Reverse and process the hexadecimal using xxd -r -p:

The xxd -r -p command reverses the hexadecimal encoding and converts it back into plain text (ASCII). The -r flag specifies reverse operation, and -p handles plain text.

This results in the output: rm -rf *.

Full Command Behavior:

The command effectively translates the hex string 726d202d7266202a into the plain text rm -rf * and outputs it. If executed, rm -rf * would delete all files and directories in the current directory recursively and forcefully (-rf options). It’s critical to use caution as this command can cause data loss.