• Home
  • Can a function be called in a sub-shell?

Can a function be called in a sub-shell?

Our expert answer
Your Q
A shell script is a list of commands in a computer program that is run by the Unix shell which is a command line interpreter. A shell script usually has comments that describe the steps. The different operations performed by shell scripts are program execution, file manipulation and text printing.
A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text.iq.opengenus.orgЗображення:iq.opengenus.orgShell 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.iq.opengenus.orgЗображення:iq.opengenus.orgA function may return a value in one of four different ways: Change the state of a variable or variables Use the exit command to end the shell script Use the return command to end the function, and return the supplied value to the calling section of the shell scriptA function will be called in a sub-shell if its output is piped somewhere else - that is, " myfunc 1 2 3 | tee out.log " will still say "x is 1" the second time around. This is because a new shell process is called to pipe myfunc ().

What is shell-scripting and how does it work?

Like any other programming language, Shell-Scripting also supports functions. Functions are popular for the following reasons: Help to reuse a piece of code. Improve the readability of the program. Make the program modular. Make maintenance easier. There are two ways of writing functions:

What is a shell function?

In this chapter, we will discuss in detail about the shell functions. Functions enable you to break down the overall functionality of a script into smaller, logical subsections, which can then be called upon to perform their individual tasks when needed. Using functions to perform repetitive tasks is an excellent way to create code reuse.

How to return a value from a function in shell script?

Use the return command to end the function, and return the supplied value to the calling section of the shell script echo output to stdout, which will be caught by the caller just as c=`expr $a + $b` is caught This is rather like C, in that exit stops the program, and return returns control to the caller.

Can a function be called in a sub-shell?

A function will be called in a sub-shell if its output is piped somewhere else - that is, " myfunc 1 2 3 | tee out.log " will still say "x is 1" the second time around. This is because a new shell process is called to pipe myfunc ().

Can a function be called in a sub-shell?

Below are two helpful articles on a similar topic 👇

How do I add an administrator to a group?

What are the built-in commands in Linux?

Tired of looking for a video answer?

The answer is near 👇

Was this article helpful?

Yes No

Thanks so much for your feedback!

Have more questions? Submit a request

FAQ in 24 hours

  • How to clear chrome cache and history on Android devices?
  • Clear browsing history in Samsung Internet. 1 Navigate to and open the Internet app, and then tap Menu (the three horizontal lines) in the lower right-hand corner. 2 Tap Settings , and the (...)


  • How do I erase everything on my Mac?
  • Click on the History menu and Show Full History Now select “Clear browsing data” in the left sidebar. A new web page will open with the option to “Clear the following items from…” Choose a time period (...)


  • How to add Google search bar to your Android phone?
  • By default, most Android phones have a Search button on the handset. When you press that button, the default Quick Search application will open (Figure A); this is where you can enter your search (...)


  • How do I remove cookies and data from my Brave browser?
  • 1. Open the Brave browser on your Android device. 2. Tap on the three dots in the lower-right corner. 3. Select History. 4. Tap on the “Clear browsing data” option at the top to quickly get rid of you (...)


  • How do I change the default search on my Android phone?
  • By default, most Android phones have a Search button on the handset. When you press that button, the default Quick Search application will open (Figure A); this is where you can enter your search stri (...)


Comments

Leave a Comment

Just Scan NOW! 📱

Email us