Shell script end program

It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. How can I write a shell script that exits, if one part of it fails? For example, if the following code snippet fails, then the script should exit. One approach would be to add set -e to the beginning of your script.

That means from help set :. You can exit a script at any place using the keyword exit. You can also specify an exit code in order to indicate to other programs that or how your script failed, e. By convention, exit code 0 is for success and anything greater than 0 signifies failure; however, also by convention, exit codes above are reserved for abnormal termination e. But in specific scenarios you may proceed differently.

Now for your case I interpret your question that if any of the five invocations of gksu fail, then you mean to exit. One way is to use a function like this. There are more advanced or sophisticated ways of how to address your question.

However, the solution above is more accessible to beginners than, say, Stephane's solution. If that part of the script is in a subshell, for instance because it's within In that case, if you want the script to exit in addition to the subshell, then you'll need to call exit upon that subshell exiting.

It can become trickier if the subshell is part of a pipeline. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How to exit a shell script if one part of it fails? Ask Question. Asked 5 years, 4 months ago. Active 19 days ago. Viewed k times. Improve this question.

Weylyn Weylyn 1 1 gold badge 6 6 silver badges 3 3 bronze badges. Add a comment. Active Oldest Votes. That means from help set : -e Exit immediately if a command exits with a non-zero status. On your Linux system, open a text editor program, open a new file to begin typing a shell script or shell programming, then give the shell permission to execute your shell script and put your script at the location from where the shell can find it.

As discussed earlier, Variables store data in the form of characters and numbers. Similarly, Shell variables are used to store information and they can by the shell only. This is a simple script. You can develop advanced scripts which contain conditional statements, loops, and functions. Shell scripting will make your life easy and Linux administration a breeze. Skip to content. What is Shell? An Operating is made of many components, but its two prime components are — Kernel Shell Components of Shell Program A Kernel is at the nucleus of a computer.

Let us understand the steps in creating a Shell Script: Create a file using a vi editor or any other editor. Name script file with extension. Save the script file as filename. Guru99 is Sponsored by Acunetix. Acunetix, the developers of dead-accurate web application security scanners have sponsored the Guru99 project to help scan for over web vulnerabilities accurately and at top speed.

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