Linux GDB Common Commands summary

View GDB's version number (1) rpm-q gdb will show if GDB is installed and the version number (2) GDB--version can also

Breakpoint	b Main; b 20;	Set breakpoints
Breakpoint If	Break function name, number if XXXX	Breakpoints set in the case of XXX do not take effect (XXX For example: variable = 3)
Cd	cd/home/yongchao/	Change the current working directory
Clear	The cursor is on the line of the break point that is about to be executed, and then hit clear	Delete a breakpoint at the stop
Info b	Info b	To view all breakpoints
Continue	Continue	Continue execution from Breakpoint
Enable	Enable Breakpoint number	Make a breakpoint effective
Disable	Disable Breakpoint number	Make a breakpoint invalid
Delete	Delete Breakpoint Number	Delete a breakpoint
Delete	Delete	Delete all Breakpoints
Display	Display variables, expressions	Displays the value of the variable or expression when the program stops (always displayed until the display is canceled)
Info display	Info display	Displays the variable number of the display
Undisplay	Undisplay number	Cancel a number always appears
Step	S	Jump into function
Until	Until	Execute directly to the function at the end or jump out of a loop
Finish	Finish	If you have entered a function and want to exit the function to return to its calling function
Shell	Shell Linux Commands	Enables you to execute UNIX shell commands without leaving GDB.
Print	Print variables	Print variables
Print	Print variable = 2	Assigning a value to a variable 2
Print	Print Find_entry (1,0)	Calls to functions in a program
Print	Print array[0]@5 (cannot be [email protected])	View the 5 elements of an array
Pager	Call Find_entry (1,10)	Calling and executing functions
Pwd	Pwd	Show Current working directory
PType	Ptyoe variable	Display the structure of a class, struct
Whatis	Whatis variable/function type	Show declaration of variable/function type
Watch	Watch variable	Observe the value of the variable and stop when there is a change
		The steps are as follows when using watch: 1. Use break to set a power outage at the point where the variable is to be observed; 2. Use Run to execute until the breakpoint; 3. Use watch to set the observer point; 4. Use continue to see if there are any changes to the observed points set.
		Watch COUNTER>15 The program terminates when Counter>15.
Delete watch number	Delete watch number	Delete Watch points
Make	Make	You can regenerate the executable file without exiting GDB
X	X/3 memory Address	The number of memory units that need to be displayed, that is, the contents of several memory units are displayed backwards from the current address, and the size of a memory unit is defined by the following U
	x/f memory Address	f indicates the format of the display: x Displays the variable in hexadecimal format. D Displays the variable in decimal format. u displays unsigned integers in decimal format. o Displays the variable in octal format. T displays the variable in binary format. A displays the variable in hexadecimal format. I instruction address format C Displays the variable in character format. F Displays the variable in floating-point number format.
	x/u memory Address	U represents the length of an address unit b represents a single byte, H represents double-byte, W represents four bytes, g = Eight bytes
	X/3DW memory Address	Print 3 x Four bytes, install 10 binary format
where	where	Use the where command to see where the program went wrong
		GDB A.out Core where View the cause of the crash

Linux GDB Common Commands summary