LinkedIn YouTube Twitter Facebook Products if thenĬopy and paste the following code to create and run a Bash script that returns an error code when the script is executed without a parameter. The following demonstrates a Bash code that returns an error code 22 when the script is executed without a parameter. Also, there is a convention for error numbers that is explained in the article Bash command line exit codes demystified. Any number greater than 0 indicates an error. By convention success is reported by exiting with the number 0. Reporting success and error in a Bash script is accomplished using status codes. cat while-loop-01.shīash while-loop-01.sh Working with status codes x=1 Ĭopy and paste the following code to create and run a Bash script that demonstrates a while loop. The following code uses the less then or equal to symbol -li to run a loop until the counter variable x reaches the number 5. Easily learn new technologies and coding concepts and quickly find the answers you need.Ī while loop runs continuously until a certain condition is met. With Red Hat Developer cheat sheets, you get essential information right at your fingertips so you can work faster and smarter.
Bash is the default shell installed on GNU/Linux distributions and many other Unix-style systems, such as macOS.Īlthough most developers have a working knowledge of Bash for everyday interactive use, few know the rich features it offers for writing scripts.
Bash is a command language interpreter: a version of the classic Unix shell with many enhancements.
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