This article introduces common techniques for debugging programs using the GDB command line. The following steps demonstrate how to quickly debug code on the command line:
Compile code: Use
gcc myprogram.c -g -o myprogram
command to compile your C program, and-g
option generates debug information.Start GDB: Use the
gdb -tui myprogram
command to start GDB, and the-tui
option enables the text user interface to facilitate viewing of code and debugging information.Set breakpoints: Use the
break main
command to set breakpoints atmain
function.Run the program: Use the
run
command to run the program, and the program will be paused at the breakpoint.
Here are some commonly used GDB commands:
Order | Abbreviation | describe |
---|---|---|
step
|
s
|
Step-by-step to enter the function inside |
next
|
n
|
Step-by-step, skip function calls |
until 123
|
unt 123
|
Run to line 123 |
info locals
|
i lo
|
Show local variables in the current scope |
print myvar
|
p myvar
|
Print the value of the variable myvar
|
display myvar
|
disp myvar
|
Display the value of the variable myvar after each execution |
undisplay myvar
|
und myvar
|
Stop displaying the value of the variable myvar
|
set myvar = 0
|
s myvar = 0
|
Set the value of the variable myvar to 0 |
break 456
|
b 456
|
Set breakpoint on line 456 |
info breakpoints
|
ib
|
List all breakpoints |
delete
|
d
|
Delete all breakpoints |
list main
|
l main
|
Jump to main function |
list foo.c:789
|
l foo.c:789
|
Jump to line 789 of file foo.c
|
where
|
whe
|
Show the current execution location |
kill
|
k
|
Terminate the current program execution |
In addition, ctrl-l
can refresh the screen; focus cmd
switches the cursor focus to the command line; focus src
switches the cursor focus to the source code display area.
The above is the detailed content of Quick debugging with gdb. For more information, please follow other related articles on the PHP Chinese website!

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