Break and continue in the shell

I see in the study not only has the break and the continue existence, as well as break-n and the continue-n existence so what difference does it have.

You can then write the test set code:

For i in a B c D
Do
Echo-n $i
For j in ' seq 10 '
Do
if test $j-eq 5
Then
Break//continue,break 2,cotinue 2
Fi
Echo-n $j

Done

　　Echo

Done

The results are as follows:

Break

a1234

b1234

c1234

d1234

Break 2:

a1234

Continue

a1234678910

b1234678910

c1234678910

d1234678910

Continue 2:

a1234b1234c1234d1234

Get the following conclusions:

With no parameters:

The break loop can only exit the inner loop.

Continue can only remove the remaining code from this cycle

With parameters:

Break n can exit N-tier loops

Continue n will remove the N-layer cyclic residual code, and the number of single cycles is unchanged.

Break and continue in the shell