GDB (GNU Project Debugger) cheatsheet

• "set logging file mylog.txt" - logs to mylog.txt
• "set logging on thread apply all bt" - logs backtraces of all threads
• "vi ~/.gdbinit dir source_dir, br somefunction etc" - add frequently used commands to gdbinit
• "gdb -tui executable" - UI mode
• "finish" - finish execution of current function and print return value
• "until linenumber" - continue execution until line number
• "advance functionname" - continue till functionname is called
• "jump location"
• "watch i" - prints when value changes
• "rwatch i" - break when variable is read
• "awatch i" - break when variable is written to or read from
• "disp i" - keep printing value of i
• "undisplay i" - stop displaying
• "set variable expression" - sets variable's value to expression
•  "x/13b 0x401820a8" - examine 13 bytes at the given address
• "layout next" -    Display the next layout.
• "layout prev" - Display the previous layout.
• "layout src" -   Display the source window only.
• "layout asm" -  Display the assembly window only.
• "layout split"  -  Display the source and assembly window.
• "layout regs" -  Display the register window together with the source or assembly window.
• "focus next | prev | src | asm | regs | split" - Set the focus to the named window. This command allows to change the active window so that scrolling keys can be affected to another window. e.g fs src
• "refresh"  - Refresh the screen. This is similar to using C-L key.
• "update"  -  Update the source window and the current execution point.
• "winheight name +count" - Increase window height
• "winheight name -count e.g: wh src -20" - Decrease window height
• "set print array on" - Pretty print arrays.
• "set print pretty on" - GDB will print structures in an indented format with one member per line
• "break linespec thread threadno if cond" - breaks at given line for given thread if condition is met
• "ptype -v struct st_one" - Prints offsets in  a structure
• "set $my_arg0=*($sp-0x64)" - defining convenience variables