How do I return a value from a function in bash?

How do I return a value from a function in bash?

When a bash function completes, its return value is the status of the last statement executed in the function, 0 for success and non-zero decimal number in the 1 – 255 range for failure. The return status can be specified by using the return keyword, and it is assigned to the variable $? .

How do you make a shell script return a value from a function?

Here are the different ways to return value in shell script function.

1. Using Echo. You can echo string at the end of your Shell script function.
2. Return Exit Status. You may also return an exist status at the end of your shell script function as shown below.
3. Using Shared Variable.

How do you return a value from a function in Linux?

return command is used to exit from a shell function. It takes a parameter [N], if N is mentioned then it returns [N] and if N is not mentioned then it returns the status of the last command executed within the function or script. N can only be a numeric value.

How do I return a bash script?

One of the many known methods to exit a bash script while writing is the simple shortcut key, i.e., “Ctrl+X”. While at run time, you can exit the code using “Ctrl+Z”.

What is $@ in bash?

bash [filename] runs the commands saved in a file. $@ refers to all of a shell script’s command-line arguments. $1 , $2 , etc., refer to the first command-line argument, the second command-line argument, etc. Place variables in quotes if the values might have spaces in them.

How do you call a function in a shell script?

To invoke a function, simply use the function name as a command. To pass parameters to the function, add space separated arguments like other commands. The passed parameters can be accessed inside the function using the standard positional variables i.e. $0, $1, $2, $3 etc.

What is $? In shell script?

$? is a special variable in shell that reads the exit status of the last command executed. After a function returns, $? gives the exit status of the last command executed in the function.

How do you call a function in shell?

How do you return a value from a function in Unix?

A function may return a value in one of four different ways:

1. Change the state of a variable or variables.
2. Use the exit command to end the shell script.
3. Use the return command to end the function, and return the supplied value to the calling section of the shell script.

How do I return in Linux terminal?

The word “return” is many time used for reference for the “Enter” key. So simply press the enter key. This should work.

What is return code in shell script?

What is an exit code in the UNIX or Linux shell? An exit code, or sometimes known as a return code, is the code returned to a parent process by an executable. On POSIX systems the standard exit code is 0 for success and any number from 1 to 255 for anything else.

What is the $? In bash?

Bash uses exit status for if Show activity on this post. $? is the result (exit code) of the last executed command.