GDB

Compile the source file to the binary file.
Add argument -g to generate a GDB binary file.

gcc -g source.c -o output
g++ -g source.cpp -o output
ls -a
total 52K
-rw-r--r-- 1 dionysen dionysen  450 Oct  5 22:26 binary-search.cpp
-rw-r--r-- 1 dionysen dionysen 2.5K Oct  2 14:29 linked-list.cpp
-rw-r--r-- 1 dionysen dionysen  411 Oct  2 14:41 node.cpp
-rwxr-xr-x 1 dionysen dionysen  37K Oct  5 23:04 output

Command	Full name	Do somthing
gdb output
r	run	Run current program
b	break	Set a breakpoint at [function] or [line] (in file)
c	continue	Continue running your program (after stopping, e.g. at a breakpoint).
n	next	Execute next program line (after stopping); step over any function calls in the line.
s	step	Execute next program line (after stopping); step into any function calls in the line.
l	list	Type the text of the program in the vicinity of where it is presently stopped.
p	print	Display the value of an expression.
watch	watch	Set a watchpoint in an address of expression
i b	info break	Check information of breakpoints.
k	kill	Kill the program being debugged.
q	quit	Exit from GDB.

• You can use shell [args] to execute a shell command.