Radare2 has an internal clipboard to save and write portions of memory loaded from the current io layer.
This clipboard can be manipulated with the y command.
The two basic operations are
copy (yank)
paste
The yank operation will read N bytes (specified by the argument) into the clipboard. We can later use the yy command to paste what we read before into a file.
You can yank/paste bytes in visual mode selecting them with the cursor mode (Vc) and then using the y and Y key bindings which are aliases for y and yy commands of the command-line interface.
[0x00000000]> y?
|Usage: y[ptxy] [len] [[@]addr] # See wd? for memcpy, same as 'yf'.
| y show yank buffer information (srcoff len bytes)
| y 16 copy 16 bytes into clipboard
| y 16 0x200 copy 16 bytes into clipboard from 0x200
| y 16 @ 0x200 copy 16 bytes into clipboard from 0x200
| yz [len] copy string (from current block) into clipboard
| yp print contents of clipboard
| yx print contents of clipboard in hexadecimal
| ys print contents of clipboard as string
| yt 64 0x200 copy 64 bytes from current seek to 0x200
| ytf file dump the clipboard to given file
| yf 64 0x200 copy 64 bytes from 0x200 from file
| yfa file copy copy all bytes from file (opens w/ io)
| yy 0x3344 paste clipboard
Sample session:
[0x00000000]> s 0x100 ; seek at 0x100
[0x00000100]> y 100 ; yanks 100 bytes from here
[0x00000200]> s 0x200 ; seek 0x200
[0x00000200]> yy ; pastes 100 bytes
You can perform a yank and paste in a single line by just using the yt command (yank-to). The syntax is as follows:
