For example, assign the value of a date formatted string: It's common to capture the output of a command using command substitution $(.) and assign it to a variable. How to capture the output of a command and assign it to an environment variable Avoid exporting variables that contain sensitive information such as API tokens by setting them for a single command only.Only export a variable if it will be used by script called from that shell or child process.Always surround variables usage with quotes, e.g.Always surround values with quotes, e.g.The naming convention is CAPITALIZED_SNAKE_CASE.No spaces on either side of the equals sign. ![]() ![]() Variable names may only contain characters (a-z,A-Z), numbers, and underscores.Here are some rules and best practices for assigning and using environment variables: The deletion of an environment variable only affects the current shell.Įnvironment variable syntax and best practices Let's look at the basics for setting and accessing environment variables using the following commands:Įnter fullscreen mode Exit fullscreen mode The values of environment variables can control the behavior of an operating system, individual utilities such as Git, shell scripts, user applications such as the Google Chrome browser, or deployed applications such as a Python web app. How to set an environment variable to be read-only.How to execute a command or script in a "clean" environment.How to pass through environment variables when using sudo.How to execute a script in the context of the current shell.Using environment variables for application secrets and credentials.Common environment variables in Linux and Mac.How to list all shell and environment variables.How to check if an environment variable exists.Setting environment variables for a single command.Scope of environment variables in shells and shell scripts.Using double or single quotes for environment variables. ![]()
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