Why do we use switch case in shell script?

1
Lazaro Roberts asked a question: Why do we use switch case in shell script?
Asked By: Lazaro Roberts
Date created: Tue, Jun 1, 2021 1:32 PM
Date updated: Wed, May 18, 2022 11:51 AM

Content

Video answer: Switch case in unix with syntax and examples

Switch case in unix with syntax and examples

Top best answers to the question «Why do we use switch case in shell script»

  • Switch case in shell scripts is an efficient alternative to the if-elif-else statement that we learned previously. The concept of the switch case statements is that we provide different cases (conditions) to the statement that, when fulfilled, will execute specific blocks of commands.

FAQ

Those who are looking for an answer to the question «Why do we use switch case in shell script?» often ask the following questions:

💻 Is shell script bash?

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. Bash can also read and execute commands from a file, called a shell script…

💻 What is shell script?

  • A shell script is a text file that contains a sequence of commands for a UNIX-based operating system.

💻 When a shell script is executed shell?

  1. Open the terminal. Go to the directory where you want to create your script.
  2. Create a file with . sh extension.
  3. Write the script in the file using an editor.
  4. Make the script executable with command chmod +x <fileName>.
  5. Run the script using ./<fileName>.

Video answer: Shell scripting tutorial for beginners 12

Shell scripting tutorial for beginners 12

Your Answer

We've handpicked 27 related questions for you, similar to «Why do we use switch case in shell script?» so you can surely find the answer!

What is cd in shell script?

Type. Command. The cd command, also known as chdir (change directory), is a command-line shell command used to change the current working directory in various operating systems. It can be used in shell scripts and batch files.

What is classpath in shell script?

The classpath is a list of the class libraries that are needed by the JVM and other Java applications to run your program. There are scripts that are included with Derby that can set up the classpath to run the Derby tools… jar files to the classpath.

What is done in shell script?
  • Keywords are for, in, do, done.
  • List is a list of variables which are separated by spaces. If list is not mentioned in the for statement, then it takes the positional parameter value that were passed into the shell.
  • Varname is any variable assumed by the user.
What is eof in shell script?

The EOF operator is used in many programming languages. This operator stands for the end of the file… Similarly, in bash, the EOF operator is used to specify the end of the file. When this operator is paired with the “cat” command in bash, it can be used to serve various other purposes.

What is if in shell script?

This block will process if specified condition is true. If specified condition is not true in if part then else part will be execute. To use multiple conditions in one if-else block, then elif keyword is used in shell.

Video answer: 09

09 What is p in shell script?

read is a bash built-in (not a POSIX shell command) that reads from standard input. The -p option makes it read as a prompt, meaning it doesn't add a trailing newline before trying to read input.

Can we create function in shell script?

One often-overlooked feature of Bourne shell script programming is that you can easily write functions for use within your script. This is generally done in one of two ways; with a simple script, the function is simply declared in the same file as it is called.

Video answer: If elif else and switch case

If elif else and switch case How do i debug a shell script?
  1. set -x : Display commands and their arguments as they are executed.
  2. set -v : Display shell input lines as they are read.
How do i input into shell script?

The most used newline character

If you don't want to use echo repeatedly to create new lines in your shell script, then you can use the \n character. The \n is a newline character for Unix-based systems; it helps to push the commands that come after it onto a new line.

How do i start a shell script?
  1. Open the terminal. Go to the directory where you want to create your script.
  2. Create a file with . sh extension.
  3. Write the script in the file using an editor.
  4. Make the script executable with command chmod +x <fileName>.
  5. Run the script using ./<fileName>.

Video answer: Shell scripting tutorial-37: the 'case' statement

Shell scripting tutorial-37: the 'case' statement How do you continue a shell script?

continue is a command which is used to skip the current iteration in for, while and until loop. It takes one more parameter [N], if N is mentioned then it continues from the nth enclosing loop.

How do you end a shell script?

To end a shell script and set its exit status, use the exit command. Give exit the exit status that your script should have. If it has no explicit status, it will exit with the status of the last command run.

How do you escape a shell script?

Escaping is a method of quoting single characters. The escape (\) preceding a character tells the shell to interpret that character literally. With certain commands and utilities, such as echo and sed, escaping a character may have the opposite effect - it can toggle on a special meaning for that character.

How do you exit from shell script?
  • Use the exit statement to indicate successful or unsuccessful shell script termination. The value of N can be used by other commands or shell scripts to take their own action. If N is omitted, the exit status is that of the last command executed. Use the exit statement to terminate shell script upon an error.
How do you run a shell script?
  • Running a shell script. To run a shell script (to have the shell read it and execute all the commands in the script), you enter a command at an interactive shell prompt as you would when doing anything else (if you're using a graphical user interface, you can probably also execute your scripts with a click of the mouse).
How do you troubleshoot a shell script?
  1. Redirect the output from the program to a file.
  2. Use the -x command parameter to run the shell script.
  3. Add echo commands to print information.
How to execute a bash shell script?

How do I start Bash shell?

  • If you are on the 64bit operating system, then follow the below steps to enable the bash shell. Click on the Start button on the bottom left corner of the screen or press the Windows key to open the Start menu. Select the Settings option in the Start menu. Click on the Update & Security icon in the Settings window.
Is writing shell script takes more time?

Without involving the file system, your scripts will likely run significantly faster. Depending on the complexity of your scripts, the difference in timing might be trivial or extremely significant.

Video answer: Bash scripting lesson 4 using case statements

Bash scripting lesson 4 using case statements What is a function in shell script?

Shell functions are a way to group commands for later execution using a single name for the group. They are executed just like a "regular" command. When the name of a shell function is used as a simple command name, the list of commands associated with that function name is executed.

What is a shell script in linux?

In Unix and Linux, the two major types of shell scripts are: Bourne again shells (BASH)- BASH is the default shell for Unix version 7. The character for prompting a bourne again shell is $. C shells- A C shell is run in a text terminal window and is able to easily read file commands.

What is binary operator in shell script?

Logical AND (&&) : This is a binary operator, which returns true if both the operands are true otherwise returns false. Logical OR (||) : This is a binary operator, which returns true is either of the operand is true or both the operands are true and returns false if none of then is false.

What is dirname $0 in shell script?

dirname command – Display directory portion of pathname. Bash parameter substitution. $0 expands to the name of the shell or shell script.

What is environment variable in shell script?

Environment variables – Variables that are exported to all processes spawned by the shell. Their settings can be seen with the env command… In the C shell, a set of these shell variables have a special relationship to a corresponding set of environment variables. These shell variables are user, term, home, and path.

Video answer: Shell scripting switch case

Shell scripting switch case