GDB commands by function

• Startup

gdb -helpprint startup help, show switchesgdb objectnormal debuggdb object corecore debug (must specify core file)gdb object pidattach to running processgdbuse file command to load object

• Help

(gdb) helplist command classes(gdb) help runninglist commands in one command class(gdb) help runbottom-level help for a command "run"(gdb) help infolist info commands (running program state)(gdb) help info linehelp for a particular info command(gdb) help showlist show commands (gdb state)(gdb) help show commandsspecific help for a show command

• Breakpoints

(gdb) break func_nameset a breakpoint on a function(gdb) break line_numset a breakpoint on a line number(gdb) break file_name:func_nameset breakpoint at file and function(gdb) break file_name:line_numset breakpoint at file and line(gdb) info breakpointsshow breakpoints(gdb) delete breakpoint_numdelete a breakpoint by number(gdb) deletedelete all breakpoints(gdb) cleardelete breakpoints at current line(gdb) clear func_namedelete breakpoints at function(gdb) clear line_numdelete breakpoints at line(gdb) disable breakpoint_numturn a breakpoint off, but don't remove it(gdb) enable breakpoint_numturn disabled breakpoint back on(gdb) tbreak func_name\linenumset a temporary breakpoint(gdb) commands break-no … endset gdb commands with breakpoint(gdb) ignore break-no countignore bpt N-1 times before activation(gdb) condition break-no expressionbreak only if condition is true(gdb) condition 2 i == 20example: break on breakpoint 2 if i equals 20(gdb) watch expressionset software watchpoint on variable(gdb) info watchpointsshow current watchpoints

• Running the program

(gdb) runrun the program with current arguments(gdb) run args redirectionrun with args and redirection(gdb) set args args…set arguments for run(gdb) show argsshow current arguments to run(gdb) contcontinue the program(gdb) stepsingle step the program; step into functions(gdb) step countsingle step count times(gdb) nextstep but step over functions(gdb) next countnext count times(gdb) CTRL-Cactually SIGINT, stop execution of current program(gdb) attach process-idattach to running program(gdb) detachdetach from running program(gdb) finishfinish current function's execution(gdb) killkill current executing program

• Stack backtrace

(gdb) btprint stack backtrace(gdb) frameshow current execution position(gdb) upmove up stack trace (towards main)(gdb) downmove down stack trace (away from main)(gdb) info localsprint automatic variables in frame(gdb) info argsprint function parameters