Use VI to edit binary files

Use VI to edit the binary file 1. open the file in binary mode # vi-B file. For example, the file content is originally hello world! 2. Switch to binary display. In vi command mode, enter: %! Xxd 000000: 6865 6c6c 6f20 776f rjc 6420 210a hello world !. 4. if you want to modify a byte, change the character on the left to the right, for example, change the w character to x, and the binary value of w to 77 and x to 78, that is to say, change the corresponding 77 to 78 to 000000: 6865 6c6c 6f20 776f rjc 6420 210a + --> here, change 77 to 78 3. switch back to vi command mode and enter: %! Xxd-r at this time, the content in the window will be changed to hello xorld! 4. Enter "wq" to save and exit. That's easy!