isenv

Determine if an environment variable exists.

📝Syntax

tf = isenv(env_name)

📥Input Arguments

Parameter	Description
env_name	string scalar, character vector, string array, cell array of character vectors: environment variable name.

📤Output Arguments

Parameter	Description
tf	logical: true if the environment variable is defined, false otherwise.

📄Description

isenv returns true if the environment variable env_name is defined in the current process environment, even when its value is empty.

If env_name is a nonscalar string array or cell array of character vectors, then tf has the same dimensions as env_name.

💡Examples

setenv('MY_ENV_VAR', 'funvalue')
isenv('MY_ENV_VAR')
isenv('A_VARIABLE_THAT_DOES_NOT_EXIST')
isenv(["MY_ENV_VAR", "A_VARIABLE_THAT_DOES_NOT_EXIST"])

🔗See Also

🕔Version History

Version	Description
2.0.0	initial version