How do you read the binary with gdb when no symbols available?

How do you read binaries that have been stripped by strip?

That means,even disas main won't work.

How can one be able to read such binar开发者_开发知识库ies?

I saw this kind of requirement in a job description before.

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1. In GDB, use addresses (disas *0x80001000) or use register values (disas $pc $pc+10).
2. Use objdump -d. It doesn't care about symbols.
3. Use IDA Pro :)