(gdb) br dowhile
Breakpoint 1 at 0x189e0: file sh.func.c, line 566.
(gdb) run -f x.csh
[...]
Breakpoint 1, dowhile (v=0x5555555fe130, c=0x5555555fdb80) at sh.func.c:566
566         int again = whyles != 0 && 
(gdb) cont
Continuing.
4
[Detaching after fork from child process 17695]

Breakpoint 1, dowhile (v=0x5555555fdd30, c=0x5555555fdaf0) at sh.func.c:566
566         int again = whyles != 0 && 
(gdb) 
Continuing.
3
[Detaching after fork from child process 17696]

Breakpoint 1, dowhile (v=0x5555555fe1a0, c=0x5555555fe310) at sh.func.c:566
566         int again = whyles != 0 && 
(gdb) 
Continuing.
2
[Detaching after fork from child process 17697]

Breakpoint 1, dowhile (v=0x5555555ff850, c=0x5555555ff6a0) at sh.func.c:566
566         int again = whyles != 0 && 
(gdb) 
Continuing.
1
[Detaching after fork from child process 17700]

Breakpoint 1, dowhile (v=0x5555555ffd60, c=0x5555555ffbb0) at sh.func.c:566
566         int again = whyles != 0 && 
(gdb) 
Continuing.
0
[Detaching after fork from child process 17701]

....


(gdb) br dowhile
Breakpoint 1 at 0x189e0: file sh.func.c, line 566.
(gdb) run -f x.csh
Breakpoint 1, dowhile (v=0x5555555fdf30, c=0x5555555f14e0) at sh.func.c:566
566         int again = whyles != 0 && 
(gdb) cont
Continuing.
4
[Detaching after fork from child process 17713]
3
[Detaching after fork from child process 17714]
2
[Detaching after fork from child process 17715]
1
[Detaching after fork from child process 17716]
0
[Detaching after fork from child process 17717]
-1
[Detaching after fork from child process 17719]
-2
[Detaching after fork from child process 17720]