unsetenv - Remove environment variable - MATLAB (original) (raw)

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Remove environment variable

Since R2022b

Syntax

Description

unsetenv([varname](#mw%5Fa468044b-d0fc-48e6-a090-3bb4a5fdb517)) removes the operating system environment variable varname. If any elements invarname do not exist, then unsetenv has no effect.

example

Examples

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Create environment variable myVar, and then check that it exists.

setenv("myVar","myValue"); isenv("myVar")

Remove myVar, and then check that it no longer exists.

unsetenv("myVar"); isenv("myVar")

Create multiple environment variables, and then check that they exist.

setenv(["Var1" "Var2" "Var3" "Var4"],["Val1" "Val2" "Val3" "Val4"]); isenv(["Var1" "Var2"; "Var3" "Var4"])

ans = 2×2 logical array

1 1 1 1

Remove two of the environment variables using unsetenv, and then check that they no longer exist.

unsetenv(["Var1" "Var4"]); isenv(["Var1" "Var2"; "Var3" "Var4"])

ans = 2×2 logical array

0 1 1 0

You can also remove environment variables using setenv with missing. Change the value of one environment variable and remove another.

setenv(["Var2" "Var3"],["ValB" missing]); isenv(["Var1" "Var2"; "Var3" "Var4"])

ans = 2×2 logical array

0 1 0 0

Input Arguments

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Environment variable names, specified as a string scalar, character vector, string array, or cell array of character vectors.

Example: "PATH"

Extended Capabilities

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Usage notes and limitations:

• Code generation does not support the use of unsetenv insideparfor loops.

Version History

Introduced in R2022b

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Remove multiple environment variables by using unsetenv with a string array or cell array of character vectors as input.