This variable is used for marking those variables and functions which are to be exported to the environment. Set -o Set Variables with Functionality Set Variable In the below table we would look at those variables and their respective functionalities. This article is about extending the environment variables, where we would use the set command to display a list of environment variables. In certain cases, the shell might be required to set some variables in order to smooth the execution of the script and these variables are known as shell variables. These types of variables are the ones that are accessible to any child process the shell script has run, unlike the local variables.
In case there are child processes that are started by the shell script, the local variables might not be accessible to the child processes. These types of variables are present only within the running instance of the shell.
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