What Does -z Imply in Bash

Bash gives a robust set of options that enable customers to automate duties and carry out advanced operations rapidly and effectively. One such function is the usage of command-line choices, which permit customers to customise the conduct of Bash instructions. One such possibility is the -z possibility, which we’ll discover on this article.

What Does -z Imply in Bash

In Bash, the -z possibility is used to check whether or not a string is empty and can be utilized with the take a look at command. The -z possibility returns true if the size of the string is zero and false in any other case, the syntax for utilizing the -z possibility with the take a look at command is as follows:

The -z possibility is used to check whether or not the variable “string” is empty so if the variable is empty, the script executes the code within the “if” block, and if it isn’t empty, the code within the “else” block is executed.

Right here is an instance script that makes use of the -z possibility to check whether or not a person has entered a command-line argument:

The take a look at command is used with the -z choice to examine whether or not the primary command-line argument is empty. Whether it is empty then the script prints “No argument supplied” and if it isn’t empty then the script prints “Argument supplied: “ adopted by the worth of the argument:

Conclusion

The -z possibility in Bash is a robust instrument for testing whether or not a string is empty and by utilizing this feature with the take a look at command, customers can automate duties and carry out advanced operations rapidly and effectively. This text explored the usage of the -z possibility and supplied an instance script that demonstrates its use.