Back-End Programming Exam > Back-End Programming Videos > Shell Scripting: Discovering to Automate Command-Line Tasks > Shell Scripting Tutorial-61: Executing Multiple Scripts
Shell Scripting Tutorial-61: Executing Multiple Scripts Video Lecture | Shell Scripting: Discovering to Automate Command-Line Tasks - Back-End Programming
FAQs on Shell Scripting Tutorial-61: Executing Multiple Scripts Video Lecture - Shell Scripting: Discovering to Automate Command-Line Tasks - Back-End Programming
| 1. What is shell scripting? |  |
Ans. Shell scripting is a way of automating repetitive tasks and executing multiple commands in a sequence using a shell interpreter. It involves writing a series of commands in a plain text file, which can then be executed as a script.
| 2. How can I execute multiple shell scripts at once? | |
Ans. To execute multiple shell scripts at once, you can create a main script that calls other scripts using the `source` command or the dot operator. For example, in a main script named "main.sh", you can include the following lines to execute other scripts:
```
#!/bin/bash
source script1.sh
source script2.sh
source script3.sh
```
Make sure to provide the correct paths to the scripts or have them in the same directory as the main script.
| 3. Can I pass arguments to the multiple shell scripts being executed? | |
Ans. Yes, you can pass arguments to the multiple shell scripts being executed. In the main script, you can pass arguments to other scripts by including them after the script name. For example, if you want to pass two arguments to "script1.sh", you can modify the source line as follows:
```
source script1.sh arg1 arg2
```
Inside "script1.sh", you can access these arguments using the positional parameters like `$1`, `$2`, etc.
| 4. How can I make sure the execution of multiple scripts continues even if one script fails? | |
Ans. To ensure that the execution of multiple scripts continues even if one script fails, you can use the `set -e` option at the beginning of the main script. This option tells the shell to exit immediately if any command in the script exits with a non-zero status. By default, this option is not enabled.
```
#!/bin/bash
set -e
source script1.sh
source script2.sh
source script3.sh
```
This way, if any script fails, the execution of the main script will stop, preventing the execution of the remaining scripts.
| 5. Is it possible to capture the output of multiple scripts executed in the main script? | |
Ans. Yes, it is possible to capture the output of multiple scripts executed in the main script. You can redirect the output of each script to a file or store it in a variable. For example, to capture the output of "script1.sh" in a file named "output1.txt", you can modify the source line as follows:
```
source script1.sh > output1.txt
```
Similarly, you can redirect the output of other scripts to different files or variables to capture their output.
Text Transcript from Video
hello guys my name is mother and welcome
to my channel this is the 61st tutorial
in the series of tutorials on UNIX shell
scripting in this tutorial we are going
to learn to execute multiple scripts
right and I have my text editor here and
I'll save three files in the home folder
the first one is called script one the
second one is script 2 and third one is
script 3 and all three are share
programs and thus they have the
extension SH right in the first script
file I'm gonna use banner to display a
message like script 1 and in this file
I'm going to type in SH space the name
of the second script file right so we
are going to execute the second script
from this grip right and in the second
script file I'll type in bannered and
then sprit do and I'll invoke the third
script by typing in SH space script 3
door SH and in the third script I'll
type in banner space script 3 within
double quotes and that's it I don't have
to execute any more scripts I save all
the three files and now I'll bring up
the terminal and execute the first
script by typing in SH space script 1
dot Sh
when I press the Enter key you see
messages you know 3 messages on screen
the first one script 1 the second in
script 2 and the third one in script 3
so what has happened here is I executed
the script 1 dot SH file in the terminal
by typing in SH base with 1 and when I
execute at that file I first you this
command were executed first and that's
why I got the message script one and
then strip two was executed because I
have this command on line three and the
same thing happened with strip two and
in script three we just have banner and
you know the commands are executed and
no more files or scripts were called
right so this is a pretty simple example
that I took to demonstrate how you can
execute one script from another square
and obviously you can do lot of exciting
things with this but you know I took
this example because I just wanted to
get the point across so thank you so
much for watching this tutorial and this
was the last tutorial in this course I
will make yet another video in this
series but you know in that video I'm
just going to discuss a few things and
you know things that I think you should
know and things that might help you
learn the subject of shell scripting in
a better way on your own in the future
and you will probably and make another
series of tutorials on shell scripting
in which I'll discuss some intermediate
and advanced level concepts but in this
tutorial this is all I have to discuss
with you guys so thank you so much for
watching I'll see you in the next video
please subscribe to my channel
to my channel this is the 61st tutorial
in the series of tutorials on UNIX shell
scripting in this tutorial we are going
to learn to execute multiple scripts
right and I have my text editor here and
I'll save three files in the home folder
the first one is called script one the
second one is script 2 and third one is
script 3 and all three are share
programs and thus they have the
extension SH right in the first script
file I'm gonna use banner to display a
message like script 1 and in this file
I'm going to type in SH space the name
of the second script file right so we
are going to execute the second script
from this grip right and in the second
script file I'll type in bannered and
then sprit do and I'll invoke the third
script by typing in SH space script 3
door SH and in the third script I'll
type in banner space script 3 within
double quotes and that's it I don't have
to execute any more scripts I save all
the three files and now I'll bring up
the terminal and execute the first
script by typing in SH space script 1
dot Sh
when I press the Enter key you see
messages you know 3 messages on screen
the first one script 1 the second in
script 2 and the third one in script 3
so what has happened here is I executed
the script 1 dot SH file in the terminal
by typing in SH base with 1 and when I
execute at that file I first you this
command were executed first and that's
why I got the message script one and
then strip two was executed because I
have this command on line three and the
same thing happened with strip two and
in script three we just have banner and
you know the commands are executed and
no more files or scripts were called
right so this is a pretty simple example
that I took to demonstrate how you can
execute one script from another square
and obviously you can do lot of exciting
things with this but you know I took
this example because I just wanted to
get the point across so thank you so
much for watching this tutorial and this
was the last tutorial in this course I
will make yet another video in this
series but you know in that video I'm
just going to discuss a few things and
you know things that I think you should
know and things that might help you
learn the subject of shell scripting in
a better way on your own in the future
and you will probably and make another
series of tutorials on shell scripting
in which I'll discuss some intermediate
and advanced level concepts but in this
tutorial this is all I have to discuss
with you guys so thank you so much for
watching I'll see you in the next video
please subscribe to my channel
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Dec 23, 2024 Last updated |
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