What is return code in shell script?
What is return code in shell script?
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. Exit codes can be interpreted by machine scripts to adapt in the event of successes of failures.
How do I find my bash return code?
To check the exit code we can simply print the $? special variable in bash. This variable will print the exit code of the last run command.
How do you return a number in shell script?
A 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 script.
How do I return a bash script?
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 $? .
How do I return in bash?
A bash function can return a value via its exit status after execution. By default, a function returns the exit code from the last executed command inside the function. It will stop the function execution once it is called. You can use the return builtin command to return an arbitrary number instead.
Which command shows the return code of the last executed command?
“$?” is a variable that holds the return value of the last executed command. “echo $?” displays 0 if the last command has been successfully executed and displays a non-zero value if some error has occurred. The bash sets “$?” To the exit status of the last executed process.
How do you return a string from a function in shell script?
Returning a string or word from a function
- You cannot return a word or anything else from a function.
- However, you can use echo or printf command to send back output easily to the script.
How do you exit a shell script function?
exit exits the calling shell or shell script with the exit status specified by n . If you omit n , the exit status is that of the last command executed (an end-of-file exits the shell). return exits a function with the return value specified by n . If you omit n , the return status is that of the last command executed.
What does $? Mean in shell?
$? = was last command successful. Answer is 0 which means ‘yes’. Follow this answer to receive notifications.