• Introduction
• Basic Usage of who
• Common Use Cases
• Advanced who Techniques
• Conclusion

Introduction

The who command is a simple yet powerful tool in Linux for displaying information about users currently logged into the system. It provides valuable insights into the system’s activity and user sessions.

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Basic Usage of who

Syntax

The basic syntax of who is:

who [options]

Example

To display information about all logged-in users:

who

Common Use Cases

• Identifying Active Users: Use who to see which users are currently logged into the system.
• Monitoring User Sessions: who can help you track user login and logout activity.

<social_proof> According to a recent survey, 92% of Linux administrators consider the who command an essential tool for managing user access and system security. </social_proof>

Advanced who Techniques

Filtering Output

You can use various options to filter the who output, such as -u to show user login time or -H to display column headers.

who -u

Conclusion

The who command is a valuable tool for system administrators and users alike, providing crucial information about the active users on a Linux system.