The gdb debugger is available for use with programs compiled with the g++ compiler. It is used to locate run-time errors.
The C++ program must be compiled with the -g flag in order to use the debugger.
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help
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to display a list of gdb commands
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help command
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to get help on a specified gdb command
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run
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to run/execute the program starting from the beginning
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continue
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to resume running/executing the program
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next
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to execute the current statement and stop at the next statement
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step
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same as next, but step into a function
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list xx
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list source lines starting at line xx
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list
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to list the next source lines
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list xx,yy
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to list sources lines from line xx to line yy
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list filename:xx
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to list source lines in the specified file starting at line xx
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quit
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to quit gdb and revert to the unix command level
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break functionname
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to set a breakpoint at the start of a function
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break classname::functionname
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to set a breakpoint at the start of a member function
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break filename:xx
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to set a breakpoint at line xx in the specified file
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break xx
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to set a breakpoint at line xx in the current file
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break 1
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to set a breakpoint at the first line in the current file (declaration or executable statement)
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info break
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to list all breakpoints (including those disabled); breakpoints are numbered #1, #2, #3, etc.
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disable xx
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to disable breakpoint #xx
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enable xx
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to enable breakpoint #xx
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print v1
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to print the value of a specified variable
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info source
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to show the name of the current source file
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info sources
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to list the name of all source files in use
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set variable = value
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to assign a new value to a specified variable
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(return)
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to re-execute the previous gdb command; this is particularly useful if the previous gdb command was next or step
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You can also execute most gdb commands by entering only the first letter of the command.
