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r2 -d /bin/ls: Opens radare2 with file /bin/ls in debugger mode using the radare2 native debugger, but does not run the program. You’ll see a prompt (radare2) - all examples are from this prompt.
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db flag: place a breakpoint at flag, where flag can be either an address or a function name
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db - flag: remove the breakpoint at flag, where flag can be either an address or a function name
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db: show list of breakpoint
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dc: run the program
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dr: Show registers state
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drr: Show registers references (telescoping) (like peda)
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ds: Step into instruction
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dso: Step over instruction
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dbt: Display backtrace
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dm: Show memory maps
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dk <signal>: Send KILL signal to child
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ood: reopen in debug mode
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ood arg1 arg2: reopen in debug mode with arg1 and arg2