set follow-fork-mode

set follow-fork-mode parent

set follow-fork-mode child

set follow-fork-mode ask

catch exec

#include <unistd.h>

int main(void) {
    execl("./b", "./b", "ab", "cd", (char*)NULL);
    return 1;
}

#include <stdio.h>

int main(int argc, char **argv ) {
    printf("%sn", argv[0]);
    printf("%sn", argv[1]);
}

gcc -g a.c -o a
gcc -g b.c -o b
gdb -nh -q a

Reading symbols from a...done.
(gdb) start
Temporary breakpoint 1 at 0x4004ea: file a.c, line 4.
Starting program: /home/cirsan01/test/gdb-exec/a

Temporary breakpoint 1, main () at a.c:4
4           execl("./b", "./b", "ab", "cd", (char*)NULL);
(gdb) file b
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Load new symbol table from "b"? (y or n) y
Reading symbols from b...done.
(gdb) b main
Breakpoint 2 at 0x4004f5: file b.c, line 4.
(gdb) n

Breakpoint 2, main (argc=0, argv=0x7fffffffa570) at b.c:4
4               printf("%sn", argv[1]);
(gdb) n
process 4877 is executing new program: /home/cirsan01/test/gdb-exec/b

Breakpoint 2, main (argc=3, argv=0x7fffffffa598) at b.c:4
4               printf("%sn", argv[1]);
(gdb) n
ab
5               printf("%sn", argv[2]);
(gdb) n
cd
6       }
(gdb)