The os module provides functions and values for interacting with the operating system.

os.getenv

The os.getenv function gets the value of an environment variable.

Syntax

os.getenv(name)

Parameters

  • name: The name of the environment variable.

Return Value

The value of the environment variable, or null if the environment variable does not exist.

Example

import os

// Get the value of the HOME environment variable
var home_dir = os.getenv('HOME')
print(home_dir)  // [value of the HOME environment variable]

// Get the value of an undefined environment variable
var undefined_var = os.getenv('UNDEFINED_VAR')
print(undefined_var)  // null

os.setenv

The os.setenv function sets the value of an environment variable.

Syntax

os.setenv(name, value)

Parameters

  • name: The name of the environment variable.
  • value: The value to set for the environment variable.

Return Value

None.

Example

import os

// Set the value of the MY_VAR environment variable
os.setenv('MY_VAR', 'value')

// Get the value of the MY_VAR environment variable
var my_var = os.getenv('MY_VAR')
print(my_var)  // 'value'

os.execute

The os.execute function executes a system command.

Syntax

os.execute(command)

Parameters

  • command: The system command to execute.

Return Value

The exit status code of the command.

Example

import os

// Execute a system command
var exit_code = os.execute('ls')
print(exit_code)  // [exit status code of the 'ls' command]

// Execute a system command and check the exit status
exit_code = os.execute('ls non-existent-dir')
if(exit_code != 0)
    print('Command failed')

os.name

The os.name value is a string that indicates the name of the operating system. It is ‘windows’ for Windows, ‘unix’ for Unix-like systems, ‘macOS’ for macOS, ’linux’ for Linux, ‘freeBSD’ for FreeBSD, or ‘other’ if it was not able to determine the operating system.

Example

import os

// Print the name of the operating system
print(os.name)

// Check if the operating system is Unix-like
if(os.name in ['unix', 'osx', 'linux', 'bsd'])
    print('Operating system is Unix-like')
else
    print('Operating system is not Unix-like')

// Check if the operating system is Windows
if(os.name == 'windows')
    print('Operating system is Windows')

os.env

The os.env value is a map that contains the environment variables of the operating system. Note: adding new keys to os.env does not add the new keys to the env variables. Use os.setenv instead.

Example

import os

// Print all environment variables
print(os.env)

// Get the value of the HOME environment variable
var home_dir = os.env['HOME']
print(home_dir)

// Set the value of the MY_VAR environment variable
os.setenv('MY_VAR', 'value')

// Get the value of the MY_VAR environment variable
var my_var = os.env['MY_VAR']
print(my_var)  // Output: 'value'