os module for system information in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the Node.js 'os' module?

The 'os' module provides methods to get information about the operating system, like CPU details, memory, and network interfaces.

beginner

How do you get the total amount of system memory using the 'os' module?

Use os.totalmem() to get the total system memory in bytes.

beginner

Which method returns the operating system's default directory for temporary files?

os.tmpdir() returns the path to the default temporary files directory.

intermediate

What does os.cpus() return?

It returns an array of objects, each describing a CPU/core's model, speed, and times spent in different modes.

beginner

How can you find the current user's home directory using the 'os' module?

Use os.homedir() to get the path of the current user's home directory.

Which method from the 'os' module gives you the system uptime in seconds?

A os.uptime()

B os.systemTime()

C os.getUptime()

D os.time()

os.uptime() returns the system uptime in seconds.

What type of value does os.freemem() return?

A Free memory in bytes

B Free memory in megabytes

C Percentage of free memory

D Boolean indicating if memory is free

os.freemem() returns the amount of free system memory in bytes.

Which method provides network interface details?

A os.interfaces()

B os.networkInterfaces()

C os.networks()

D os.netInfo()

os.networkInterfaces() returns an object describing the network interfaces.

How do you get the operating system platform (like 'linux' or 'win32')?

A os.type()

B os.system()

C os.platform()

D os.osName()

os.platform() returns the operating system platform.

What does os.endianness() return?

A The OS version

B The CPU speed in MHz

C The number of CPU cores

D The byte order of the CPU ('BE' or 'LE')

os.endianness() returns the CPU byte order: 'BE' for big-endian or 'LE' for little-endian.

Explain how you would use the 'os' module to find out the total and free memory on a system.

Think about methods that return memory info in bytes.

Describe how to get CPU information and network interfaces using the 'os' module.

Look for methods that return arrays or objects with system hardware info.