Software Development Exam > Software Development Videos > Complete Linux Course: Become a Linux Professional > Shell Scripting Tutorial for Beginners 18 - UNTIL loop
Shell Scripting Tutorial for Beginners 18 - UNTIL loop Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development
FAQs on Shell Scripting Tutorial for Beginners 18 - UNTIL loop Video Lecture - Complete Linux Course: Become a Linux Professional - Software Development
| 1. What is an UNTIL loop in shell scripting? |  |
Ans. An UNTIL loop in shell scripting is a control structure that repeatedly executes a set of commands as long as the specified condition is false. It is similar to the WHILE loop, but the commands inside the loop are executed until the condition becomes true.
| 2. How does an UNTIL loop work in shell scripting? | |
Ans. In an UNTIL loop, the condition is checked before executing the commands inside the loop. If the condition is false, the commands are executed, and the condition is checked again. This process continues until the condition becomes true, at which point the loop terminates.
| 3. What is the syntax of an UNTIL loop in shell scripting? | |
Ans. The syntax of an UNTIL loop in shell scripting is as follows:
```
until [ condition ]
do
# Commands to be executed
done
```
The condition is checked before executing the commands inside the loop. If the condition is false, the commands are executed, and the condition is checked again. This process continues until the condition becomes true.
| 4. Can I use multiple conditions in an UNTIL loop? | |
Ans. No, an UNTIL loop in shell scripting supports only a single condition. However, you can use logical operators such as && (AND) or || (OR) to combine multiple conditions into a single one.
For example:
```
until [ condition1 ] && [ condition2 ]
do
# Commands to be executed
done
```
This way, you can achieve multiple conditions within the loop.
| 5. How do I exit an UNTIL loop before the condition becomes true? | |
Ans. To exit an UNTIL loop before the condition becomes true, you can use the `break` statement. When the `break` statement is encountered within the loop, the control jumps out of the loop and continues with the next statement after the loop.
For example:
```
until [ condition ]
do
# Commands to be executed
if [ some_condition ]
then
break
fi
done
```
In the above example, if the `some_condition` becomes true, the `break` statement is executed, and the loop is exited.
Text Transcript from Video
hey guys welcome to the next video on
shell scripting tutorial for beginners
in this video we will learn how to use
until loops in shell scripting now until
loops are almost similar to while you
but with a slight difference and the
difference we are going to see in a
moment but let's see first the syntax of
until loop so the syntax of until loop
is like this so you use the keyword
until and then in square brackets or in
double parenthesis also you give a
condition and if the condition is false
then the commands between the keyword do
and done are executed right so the
difference is in the while loop if the
condition is true then only the commands
are executed in the until loop the
condition is false then only the
commands are executed right so let's
take an example so once again for
example I want to print the value one to
ten on the terminal so I will declare a
variable and assign a value of 1 to it
and in the condition this time I want to
write here dollar n and then I will just
give it a flag GE which is greater than
or equal to right and then 10 so we want
to evaluate the condition if the value
of n is greater than or equal to 10 and
if it's not greater than or equal to 10
then it's going to echo the value of n
for example right so we will just write
like this and to increment the value of
n we can just write this notation so
just write and is equal to double
parenthesis and then n plus 1 here okay
so let's run the script and let's see
what happens so I am going to run the
script and it prints the value 1 to 9
and why it's happening here because this
condition is false
whenever we start
our script n is equal to one here right
so when this point is reached the N is
equal to 1 which is not greater 210 or
not greater than or equal to 10 so it
goes here right so it's checks for the
false condition right and then if the
condition is false which is false in
this case because n is not greater than
or equal to 10 then it prints this value
with the echo command and then increment
the value of n by this right and it goes
on and on and on until the value of n
becomes 11 which is greater than or
equal to 10 which is true
so if the condition is true this is not
executed right now if I want to print 1
to 10 I need to just write greater than
here not greater than or equal to what's
greater than right once again when I run
the script it prints 1 to 10 right
similar to a while loops you can just
use these double parentheses here to
evaluate the condition and we will just
do something like this but instead of
greater than you just need to write
something like this so until the n is
not greater than 10 then we will execute
the command so once again the values are
printed 1 to 10 right and as we have
seen we can increment the value of n in
few ways so the post increment is
possible let me clear the terminal and
once again run the script and the result
will be same and pre increment is also
possible so like this and once again run
the script and give us the similar
result okay so in this way you can use
until loop in shell scripting I hope you
enjoyed this video please recommend
subscribe and bye for now
shell scripting tutorial for beginners
in this video we will learn how to use
until loops in shell scripting now until
loops are almost similar to while you
but with a slight difference and the
difference we are going to see in a
moment but let's see first the syntax of
until loop so the syntax of until loop
is like this so you use the keyword
until and then in square brackets or in
double parenthesis also you give a
condition and if the condition is false
then the commands between the keyword do
and done are executed right so the
difference is in the while loop if the
condition is true then only the commands
are executed in the until loop the
condition is false then only the
commands are executed right so let's
take an example so once again for
example I want to print the value one to
ten on the terminal so I will declare a
variable and assign a value of 1 to it
and in the condition this time I want to
write here dollar n and then I will just
give it a flag GE which is greater than
or equal to right and then 10 so we want
to evaluate the condition if the value
of n is greater than or equal to 10 and
if it's not greater than or equal to 10
then it's going to echo the value of n
for example right so we will just write
like this and to increment the value of
n we can just write this notation so
just write and is equal to double
parenthesis and then n plus 1 here okay
so let's run the script and let's see
what happens so I am going to run the
script and it prints the value 1 to 9
and why it's happening here because this
condition is false
whenever we start
our script n is equal to one here right
so when this point is reached the N is
equal to 1 which is not greater 210 or
not greater than or equal to 10 so it
goes here right so it's checks for the
false condition right and then if the
condition is false which is false in
this case because n is not greater than
or equal to 10 then it prints this value
with the echo command and then increment
the value of n by this right and it goes
on and on and on until the value of n
becomes 11 which is greater than or
equal to 10 which is true
so if the condition is true this is not
executed right now if I want to print 1
to 10 I need to just write greater than
here not greater than or equal to what's
greater than right once again when I run
the script it prints 1 to 10 right
similar to a while loops you can just
use these double parentheses here to
evaluate the condition and we will just
do something like this but instead of
greater than you just need to write
something like this so until the n is
not greater than 10 then we will execute
the command so once again the values are
printed 1 to 10 right and as we have
seen we can increment the value of n in
few ways so the post increment is
possible let me clear the terminal and
once again run the script and the result
will be same and pre increment is also
possible so like this and once again run
the script and give us the similar
result okay so in this way you can use
until loop in shell scripting I hope you
enjoyed this video please recommend
subscribe and bye for now
Related Exams
About this Video
|
4.89/5 Rating |
|
Oct 24, 2024 Last updated |
Video Description: Shell Scripting Tutorial for Beginners 18 - UNTIL loop for Software Development 2024 is part of Complete Linux Course: Become a Linux Professional preparation.
The notes and questions for Shell Scripting Tutorial for Beginners 18 - UNTIL loop have been prepared according to the Software Development exam syllabus.
Information about Shell Scripting Tutorial for Beginners 18 - UNTIL loop covers all important topics for Software Development 2024 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Shell Scripting Tutorial for Beginners 18 - UNTIL loop.
Introduction of Shell Scripting Tutorial for Beginners 18 - UNTIL loop in English is available as part of our Complete Linux Course: Become a Linux Professional for Software Development & Shell Scripting Tutorial for Beginners 18 - UNTIL loop in
Hindi for Complete Linux Course: Become a Linux Professional course. Download more important topics related with notes, lectures and mock test series for
Software Development Exam by signing up for free.
Description
Video Lecture & Questions for Shell Scripting Tutorial for Beginners 18 - UNTIL loop Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development - Software Development full syllabus preparation | Free video for Software Development exam to prepare for Complete Linux Course: Become a Linux Professional.
Information about Shell Scripting Tutorial for Beginners 18 - UNTIL loop
Here you can find the meaning of Shell Scripting Tutorial for Beginners 18 - UNTIL loop defined & explained in the simplest way possible.
Besides explaining types of Shell Scripting Tutorial for Beginners 18 - UNTIL loop theory, EduRev gives you an ample number of questions to practice Shell Scripting Tutorial for Beginners 18 - UNTIL loop tests,
examples and also practice Software Development tests.
|
Explore Courses for Software Development exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Shell Scripting Tutorial for Beginners 18 - UNTIL loop Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development
,Exam
,Shell Scripting Tutorial for Beginners 18 - UNTIL loop Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development
,study material
,Semester Notes
,Free
,ppt
,mock tests for examination
,shortcuts and tricks
,video lectures
,practice quizzes
,Summary
,past year papers
,Shell Scripting Tutorial for Beginners 18 - UNTIL loop Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development
,Objective type Questions
,Viva Questions
,Sample Paper
,Previous Year Questions with Solutions
,Important questions
,MCQs
,Extra Questions
;
Study Shell Scripting Tutorial for Beginners 18 - UNTIL loop on the App
Students of Software Development can study Shell Scripting Tutorial for Beginners 18 - UNTIL loop alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Shell Scripting Tutorial for Beginners 18 - UNTIL loop,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Shell Scripting Tutorial for Beginners 18 - UNTIL loop is prepared as per the latest Software Development syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up
within 7 days!
within 7 days!
Takes less than 10 seconds to signup