Shell Scripting Tutorial-52: The 'break' Statement Video Lecture | Shell Scripting: Discovering to Automate Command-Line Tasks - Back-End Programming

hello guys my name is Martin and welcome
to my channel this is the fifty second
tutorial in the series of tutorials on
your next shell scripting in this
tutorial we're going to check out the
break statement now whenever the keyword
break is encountered inside any lube the
control automatically passes to the
first statement off the loop and we're
going to check out break in a shell
script of course so I have my text
writer here and I've saved this file in
the home folder it has the name break
and the extension SH so what I'm going
to do in the script is I'm going to use
a while loop to generate ten numbers for
me and of course I have to first create
and initialize the control variable for
my loop and I'm going to call this one
count and I'll give it the value one on
line two I'm going to type in the
keyword while and then then the test
condition we'll use square brackets and
my condition for this loop is going to
be Y dollar count is less than equal to
ten right on line three I'll type in the
keyword do get inside the body of I'll
and then I just use echo to display the
value of control variable and that's
going to be ecuador account and then of
course I'll increment the control
variable using expr because we want a
new value for each hydration so the
condition the expression sorry is going
to be exp our space dollar count the
addition symbol and then one and the
expression is going to grow within two
bursts codes and I'll type in the
keyword done on line 6 and on line 8
I'll just use echo to display a message
to us like we are out of the loop right
I'll save this file and I'll bring up
the terminal and I'll execute the script
by typing in SH space break or Sh and
when I press the Enter key you see
numbers from 1 to 10 on screen and then
you see the statement we are to do so
this statement the echo statement on
line 8 got executed once I've finished
doing its work right and while obviously
had 10 iterations because we saw that
numbers on screen but if suppose you
want to have while you have fewer
iterations than 10 what
we do is you can either make changes to
the test condition online - or if you do
not want to make test changes to the
test condition then you can use the
break statement and now what I'm going
to do is I'm going to make the script
display numbers from 1 to 5 instead of 1
then without making changes to the test
condition so on line 4 I'm gonna type in
the keyword F and the test condition for
the if statement is going to be told
count
- eq6 okay get inside the if block I'll
type in the keyword then and then I'll
use the keyword break terminate my
afloat by typing in Fi and I'll save the
file the bender I'll clear the screen
first and when I execute the script now
you see numbers from 1 to 5 and then you
see a statement here are the room so
what has happened is this if statement
were executed in the first 5 iterations
as well but since the test condition
evaluated Falls for the first 5
iterations the break statement didn't
get executed but when the control
variable reached the value 6 this if
statement returned a true value and the
if block got executed and the break
statement that is got executed and while
finished doing its work so basically
what the break statement does is it
forces the loop to stop working right so
if suppose I'm changed 6 to 4 here and
save the file and execute the script
then you would see numbers from 1 to 3
right so break is used for prematurely
terminating a looping construct so
that's it for now I see you guys in the
next tutorial in which we're going to
check out the continue statement thank
you so much for watching this tutorial
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