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Useful commands in gdb

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 $ \ast<$ 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>)


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``Getting Started with the Synthesis Tool Kit (STK)'', by Julius O. Smith III, Music 420 Reader supplementing the text).
Copyright © 2015-03-31 by Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA),   Stanford University
CCRMA