radare2: add page (#3433)

pages/common/radare2.md

@@ -0,0 +1,28 @@
+# radare2
+
+> A set of reverse engineering tools.
+> More information: <https://radare.gitbooks.io/radare2book/>.
+
+- Open a file in write mode without parsing the file format headers:
+
+`radare2 -nw {{path/to/binary}}`
+
+- Debug a program:
+
+`radare2 -d {{path/to/binary}}`
+
+- Run a script before entering the interactive CLI:
+
+`radare2 -i {{path/to/script.r2}} {{path/to/binary}}`
+
+- Show help text for any command in the interactive CLI:
+
+`> {{radare2_command}}?`
+
+- Run a shell command from the interactive CLI:
+
+`> !{{shell_command}}`
+
+- Dump raw bytes of current block to a file:
+
+`> pr > {{path/to/file.bin}}`