GDB

Cheatsheet
Command
Shortcut
Purpose
list main
li main
Shows source code of main function (only if compiled with gcc -g)
break main
break 10
br main
br 10
Sets a break point at the start of the main function, sets break point at line 10 of provided source code (if compiled with source)
run
run haha
r
r haha
Runs the program from the beginning. Adds haha as a cmd line arg.
continue
c
Continues the program execution after hitting a breakpoint
next instruction
n i
Go to the next instruction and stop execution
inspect registers
i r
i r esp ebp eip
Inspect registers at the current point in execution. Can specify individual or multiple registers as well to reduce output on screen.
examine/5instructions $eip
x/5i $eip
Examine the next 5 instructions of the EIP register.
x/8xb $eip
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Examine the next 8 hex bytes of the EIP register
x/6cb 0x8048484
x/s 0x8048484
inspect chars and strings
Inspect the next six bytes as char and print their values
Inspect the string stored at the memory location
x/o
x/x
x/u
x/t
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Octal
hex
Unsigned base-10 int
binary
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Last modified 1yr ago

Command	Shortcut	Purpose
`list main`	`li main`	Shows source code of `main` function (only if compiled with `gcc -g`)
`break main` `break 10`	`br main` `br 10`	Sets a break point at the start of the `main` function, sets break point at line 10 of provided source code (if compiled with source)
`run` `run haha`	`r` `r haha`	Runs the program from the beginning. Adds `haha` as a cmd line arg.
`continue`	`c`	Continues the program execution after hitting a breakpoint
`next instruction`	`n i`	Go to the next instruction and stop execution
`inspect registers`	`i r` `i r esp ebp eip`	Inspect registers at the current point in execution. Can specify individual or multiple registers as well to reduce output on screen.
`examine/5instructions $eip`	`x/5i $eip`	Examine the next 5 instructions of the EIP register.
`x/8xb $eip`		Examine the next 8 hex bytes of the EIP register
`x/6cb 0x8048484` `x/s 0x8048484`	inspect chars and strings	Inspect the next six bytes as char and print their values Inspect the string stored at the memory location
`x/o` `x/x` `x/u` `x/t`		Octal hex Unsigned base-10 int binary