Below is a useful subset of gdb commands, listed roughly in the order they might be needed. The first column gives the command, with optional characters enclosed in [square brackets]. For example, the run command can be abbreviated r. The second column gives a short description of the command. Type help <command> in gdb to obtain more information on each command.
| h[elp] | Get help on gdb commands |
h[elp] 
cmd
|
Get help on a specific gdb command |
| r[un] | Run to next breakpoint or to end |
| s[tep] | Single-step, descending into functions |
| n[ext] | Single-step without descending into functions |
| fin[ish] | Finish current function, loop, etc. (useful!) |
| c[ontinue] | Continue to next breakpoint or end |
| up | Go up one context level on stack (to caller) |
| do[wn] | Go down one level (only possible after up) |
| l[ist] | Show lines of code surrounding the current point |
|
p[rint]
name
|
Print value of variable called
name
|
p 
name
|
Print what is pointed to by
name
|
|
p/x
name
|
Print value of
name
in hex format |
|
p
name
@
n
|
print
n
values starting at
name
|
|
p
chars
tab
|
List all variables starting with
chars
|
|
b[reak]
name
|
Set a breakpoint at function
name
|
|
b
class
::
name
|
Set a breakpoint at
name
in
class
|
|
b
class
::
tab
|
List all members in
class
|
| h[elp] b | Documentation for setting breakpoints |
| i[nfo] b | List breakpoints |
| i | List all info commands |
| dis[able] 1 | Disable breakpoint 1 |
| en[able] 1 | Enable breakpoint 1 |
| d[elete] 1 | Delete breakpoint 1 |
| d 1 2 | Delete breakpoints 1 and 2 |
| d | Delete all breakpoints |
|
cond[ition] 1
expr
|
Stop at breakpoint 1 only if
expr
is true |
| cond 1 | Make breakpoint 1 unconditional |
| comm[ands] 1 | Add a list of gdb commands to execute |
| each time breakpoint 1 is hit | |
| (usually just print <var>) |