nvram MacOS Command Guide
The MacOS nvram command allows users to interact with the system’s Non-Volatile Random-Access Memory (NVRAM) variables. NVRAM is a small amount of memory that stores system settings even when the computer is turned off. With the nvram command, you can view, set, and delete these variables, which can be useful for troubleshooting system issues, changing startup disk preferences, or modifying system configurations. By using the nvram command in the Terminal, you can access and manipulate these NVRAM variables to customize your MacOS operating system.
nvram Syntax:
Section titled “nvram Syntax:”nvram [options] [parameters]Options:
Section titled “Options:”| Option | Description |
|---|---|
| -c | Clear all settings in NVRAM |
| -d | Delete a variable from NVRAM |
| -p | Print all variables in NVRAM |
| -x | Print all variables in XML format |
Parameters:
Section titled “Parameters:”| Parameter | Description |
|---|---|
| variable | Name of the variable to delete or view |
| name=value | Set the value of the specified variable |
nvram Command Samples:
Section titled “nvram Command Samples:”Display all NVRAM variables
Section titled “Display all NVRAM variables”nvram -pThis command displays all NVRAM variables currently set on the system.
Set a specific NVRAM variable
Section titled “Set a specific NVRAM variable”nvram my_variable="example value"This command sets a specific NVRAM variable with the value “example value”.
Delete a specific NVRAM variable
Section titled “Delete a specific NVRAM variable”nvram -d my_variableThis command deletes a specific NVRAM variable named “my_variable”.
Reset NVRAM to default settings
Section titled “Reset NVRAM to default settings”nvram -cThis command resets the NVRAM to its default settings.
View a specific NVRAM variable value
Section titled “View a specific NVRAM variable value”nvram my_variableThis command displays the value of a specific NVRAM variable named “my_variable”.
Clear all NVRAM variables
Section titled “Clear all NVRAM variables”nvram -cThis command clears all NVRAM variables currently set on the system.
Enable verbose mode for NVRAM operation
Section titled “Enable verbose mode for NVRAM operation”nvram -xThis command enables verbose mode for NVRAM operation, providing more detailed information.
How can I display all the NVRAM variables set in MacOS?
Section titled “How can I display all the NVRAM variables set in MacOS?”To display all the NVRAM variables set in MacOS, you can use the following command:
nvram -pHow do I set a new variable with a value using nvram in MacOS?
Section titled “How do I set a new variable with a value using nvram in MacOS?”To set a new variable with a value using nvram in MacOS, you can execute the following command:
sudo nvram my_variable="my_value"How can I delete a specific NVRAM variable in MacOS using nvram?
Section titled “How can I delete a specific NVRAM variable in MacOS using nvram?”To delete a specific NVRAM variable in MacOS using nvram, you can run the following command:
sudo nvram -d my_variableHow can I reset the entire NVRAM to default values in MacOS?
Section titled “How can I reset the entire NVRAM to default values in MacOS?”To reset the entire NVRAM to default values in MacOS, you can use the following command:
sudo nvram -cHow do I set the boot-args variable in MacOS using nvram?
Section titled “How do I set the boot-args variable in MacOS using nvram?”To set the boot-args variable in MacOS using nvram, you can run the following command:
sudo nvram boot-args="-v"How can I enable verbose mode during boot using nvram in MacOS?
Section titled “How can I enable verbose mode during boot using nvram in MacOS?”To enable verbose mode during boot using nvram in MacOS, enter the following command:
sudo nvram boot-args="-v"Applications of the nvram command
Section titled “Applications of the nvram command”- Storing non-volatile random-access memory variables.
- Reading firmware variables.
- Setting firmware variables.
- Inspecting firmware variables.
- Modifying firmware variables.
- Resetting firmware variables to default values.