基本命令
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Most command names in radare are derived from action names. They should be easy to remember, as they are short. Actually, all commands are single letters. Subcommands or related commands are specified using the second character of the command name. For example, / foo is a command to search plain string, while /x 90 90 is used to look for hexadecimal pairs.
The general format for a valid command (as explained in the chapter) looks like this:
For example,
If a command starts with =!, the rest of the string is passed to the currently loaded IO plugin (a debugger, for example). Most plugins provide help messages with =!? or =!help.
If a command starts with !, posix_system() is called to pass the command to your shell. Check !? for more options and usage examples.
The meaning of the arguments (iter, addr, size) depends on the specific command. As a rule of thumb, most commands take a number as an argument to specify the number of bytes to work with, instead of the currently defined block size. Some commands accept math expressions or strings.
The @ sign is used to specify a temporary offset location or a seek position at which the command is executed, instead of current seek position. This is quite useful as you don't have to seek around all the time.
Using @@ you can execute a single command on a list of flags matching the glob. You can think of this as a foreach operation:
The > operation is used to redirect the output of a command into a file (overwriting it if it already exists).
The | operation (pipe) is similar to what you are used to expect from it in a *NIX shell: an output of one command as input to another.
You can pass several commands in a single line by separating them with a semicolon ;:
Using _, you can print the result that was obtained by the last command.