GDB QUICK REFERENCE
GDB QUICK REFERENCE
GDB Version 4
Essential Commands
program [core] debug program [using coredump core]
le:]function
set breakpoint at function [in le]
run [arglist]
start your program [with arglist]
bt
backtrace: display program stack
p expr
display the value of an expression
c
continue running your program
n
next line, stepping over function calls
s
next line, stepping into function calls
gdb
b [
Starting GDB
gdb
gdb
gdb
program
program core
gdb --help
Stopping GDB
quit
INTERRUPT
Getting Help
help
help
class
help command
start GDB, with no debugging les
begin debugging program
debug coredump core produced by
program
describe command line options
arglist
list classes of commands
one-line descriptions for commands in
class
describe command
kill
tty dev
set args arglist
set args
show args
use dev as stdin and stdout for next
specify arglist for next run
specify empty argument list
display argument list
show environment
show env var
set env var string
unset env var
show all environment variables
show value of environment variable var
set environment variable var
remove var from environment
run
Shell Commands
cd dir
pwd
make : : :
shell cmd
[ ]
change working directory to dir
Print working directory
call \make"
execute arbitrary shell command string
surround optional arguments
:::
show one or more arguments
c 1991, 1992 Free Software Foundation, Inc.
Permissions on back
set breakpoint at line number [in le]
eg: break main.c:37
set breakpoint at function [in le]
set break at o set lines from current stop
tbreak : : :
rbreak regex
watch expr
catch x
set breakpoint at address addr
set breakpoint at next instruction
break conditionally on nonzero expr
new conditional expression on breakpoint
n; make unconditional if no expr
temporary break; disable when reached
break on all functions matching regex
set a watchpoint for expression expr
break at C++ handler for exception x
info break
info watch
show de ned breakpoints
show de ned watchpoints
clear
delete
delete
delete
delete
break
break : : : if
cond
n [expr]
expr
le:]fun
le:]line
delete [n]
clear [
disable [n]
enable [n]
enable once [n]
enable del [n]
ignore
start your program with arglist
start your program with current argument
list
start your program with input, output
redirected
kill running program
run : : : outf
le:]line
b [ le:]line
break [ le:]function
break +o set
break -o set
break *addr
clear [
exit GDB; also q or EOF (eg C-d)
(eg C-c) terminate current command, or
send to running process
Executing your Program
run
run
Breakpoints and Watchpoints
break [
n count
commands n
[silent]
command-list
end
Program Stack
backtrace [n]
bt [n]
frame [n]
up n
down
info
info
info
info
info
info
n
frame [addr]
args
locals
reg [rn]: : :
all-reg [rn]
catch
breakpoints
breakpoints
breakpoints
breakpoints
at next instruction
at entry to fun()
on source line
[or breakpoint n]
disable breakpoints [or breakpoint n]
enable breakpoints [or breakpoint n]
enable breakpoints [or breakpoint n];
disable again when reached
enable breakpoints [or breakpoint n];
delete when reached
ignore breakpoint n, count times
execute GDB command-list every time
breakpoint n is reached. [silent
suppresses default display]
end of command-list
print trace of all frames in stack; or of n
frames|innermost if n>0, outermost if
n ................
................
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