% cat -n ccc.c
	 1 func( x )
	 2 int x;
	 3 {
	 4 	if( x < 8 )
	 5 		printf("Data %d, Oct:%02o, Hex:%02X\\n", x, x, x);
	 6 	else
	 7 		printf("Data %d, Oct:%o, Hex:%X\\n", x, x, x);
	 8 }
	 9 main()
	10 {
	11 	int i;
	12 	for(i=0;i≶10;i++\func(i);) h
	13 }
	% cc ccc.c -g -o ccc
	% gdb ccc
	gdb version 3.0.1
	Type 'help' for help.
	main:  12  for(i=0;i<10;i++\func(i);) h
	(gdb) trace i at 4 if i > 5
	[2] if i > 5 { i }  at "ccc.c":4
	(gdb) run
	Data 0, Oct:00, Hex:00
	Data 1, Oct:01, Hex:01
	Data 2, Oct:02, Hex:02
	Data 3, Oct:03, Hex:03
	Data 4, Oct:04, Hex:04
	Data 5, Oct:05, Hex:05
	[2] [func:4 ,0x400b6c]: i = 6
	Data 6, Oct:06, Hex:06
	[2] [func:4 ,0x400b6c]: i = 7
	Data 7, Oct:07, Hex:07
	[2] [func:4 ,0x400b6c]: i = 8
	Data 8, Oct:10, Hex:8
	[2] [func:4 ,0x400b6c]: i = 9
	Data 9, Oct:11, Hex:9
	Program terminated normally

	% cat -n hello.c
	    1 main()
	    2 {
	    3     char buff[80];
	    4
	    5     printf("Your name please: ");
	    6     scanf("%s",buff);
	    7     printf("\\nThank you %s-san\\n",buff);
	    8     puts("How are you?\\n");
	    9 }
	% cc hello.c -g
	% gdb a.out
	gdb version 3.0.1
	Type 'help' for help.
	main:
	5 printf("Your name please: ");
	(gdb) stop at 6
	[2] stop at "hello.c":6
	(gdb) run
	[2] stopped at
	[main:6 ,0x400bc8]
	scanf("%s",buff);
	(gdb) status
	[2] stop at "hello.c":6
	(gdb) delete 2
	(gdb) run
	Your name please: 
	Ycos
	Thank you Ycos-san
	How are you?
	Program terminated normally
	(gdb) quit

	% gdb a.out
	gdb version 3.0.1
	Type 'help' for help.
	main: 11 red();
	(gdb) stop at 3
	[2] stop at "bbb.c":3
	(gdb) run
	[2] stopped at
	[red:3 ,0x400b88]
	printf("This is RED\\n");
	(gdb) next
	This is RED [red:4 ,0x400ba8]
	(gdb) cont
	This is BLUE
	The END
	Program terminated normally

	% gdb a.out
	gdb version 3.0.1
	Type 'help' for help.
	main:  11  red();
	(gdb) stop at 3
	[2] stop at "bbb.c":3
	(gdb) run
	[2] stopped at
	[red:3 ,0x400b88]
	printf("This is RED\\n");
	(gdb) step
	This is RED
	[red:4 ,0x400ba8]
	(gdb) step
	[main:12 ,0x400c30]
	blue();
	(gdb) step
	[blue:7 ,0x400bd8]
	printf("This is BLUE\\n");
	(gdb) step
	This is BLUE
	[blue:8 ,0x400bf8]
	(gdb) step
	[main:13 ,0x400c38]
	printf("The END\\n");
	(gdb) step
	The END
	[main:14 ,0x400c58]

	% gdb a.out
	gdb version 3.0.1
	Type 'help' for help.
	main:  11  red();
	(gdb) stop at 3
	[2] stop at "bbb.c":3
	(gdb) run
	[2] stopped at
	[red:3 ,0x400b88]
	printf("This is RED\\n");
	(gdb) next
	This is RED
	[red:4 ,0x400ba8]
	(gdb) next
	[main:12 ,0x400c30]
	blue();
	(gdb) next
	This is BLUE
	[main:13 ,0x400c38]
	printf("The END\\n");
	(gdb) next
	The END
	[main:14 ,0x400c58]
	(gdb) next
	[__start:196 ,0x400ad8]
	Source not available

	(gdb) set $page=1	(gdb)set $page=0
	(gdb) set		(gdb)set
	$rld_root       ""		$rld_root	""
	$job_control    1		$job_control    1
	$newevent       3		$newevent       3
		:				:
	$printwhilestep 0		$cursource      "pz_kdtree.c"
	$printwide      0		$curpc          4834306948
	More (n if no)?			   < 最後までとまらない >

	4  char *text="This is SAMPLE.";
	(gdb) stop in 6
	[2] stop at 6
	(gdb) run
	[2] stopped at [main:6 ,0x400be8] printf("%c\\n",text[i]);
	(gdb) next
	T
	[main:6 ,0x400be8] printf("%c\\n",text[i]);
	(gdb) next
	h
	[main:6 ,0x400be8] printf("%c\\n",text[i]);
	(gdb) p i
	2
	(gdb) assign i=8
	8
	(gdb) next
	S
	[main:6 ,0x400be8] printf("%c\\n",text[i]);
	(gdb) next
	A
	[main:6 ,0x400be8] printf("%c\\n",text[i]);
	(gdb) set
	$stop_on_fork   1
	$stop_on_exec   1
		: 中略
	$regstyle       1
	$readtextfile   1
	More (n if no)?n
	(gdb) set $prompt="DEBUG> "
	DEBUG> quit

	% cat -n a.c
	    1 #include 
	    2 #include 
	    3 #define MSG "Hello!\\n"
	    4
	    5 main()
	    6 {
	    7 FILE *log;
	    8
	    9 log=fopen("/log","w+");
	    10 write(fileno(log), MSG, sizeof MSG );
	    11 fclose(log);
	    12 }
	% a.out
	Memory fault(コアダンプ)
	% gdb a.out core
	gdb version 3.11.10
	Type 'help' for help.
	Core file created by program "b"

	signal Segmentation fault at   [main:10 +0x4,0x120001344]       write(fileno(log
	), MSG, sizeof MSG );
	(gdb) where
	>  0 main() ["b.c":10, 0x120001344]
	(gdb) dump
	main() ["b.c":10, 0x120001344]
	log = (nil)
	(gdb) quit

(gdb) list 1
    1 #include 
    2
    3 #define SEG_MAX 5
    4
         : 中略
   11 XGCValues gcvalue;
   12 int i,x, y, width, height;
(gdb) set $listwindow=20
(gdb) list 1
    1 #include 
    2
    3 #define SEG_MAX 5
    4
             : 中略
   17 x = y = 0;
   18 width = XDisplayWidth (display, 0);
   19 height = XDisplayHeight (display, 0);
   20 window = XCreateSimpleWindow (display, 

定義されている alias を解除するには unalias コマンドを用います。