How to see the running process in Linux?

How to See the Running Process in Linux

Introduction

In Linux, managing processes is a crucial aspect of system administration. Understanding how to see the running process in Linux can help you diagnose and troubleshoot issues with your system. In this article, we will explore the different ways to see the running process in Linux, including the command-line interface, graphical interface, and system logs.

Command-Line Interface

The command-line interface (CLI) is the most common way to see the running process in Linux. Here are the steps to follow:

• Use the ps command: The ps command is used to display process information, including the process ID (PID), name, command, and memory usage. To use the ps command, open a terminal and type ps -ef (for detailed information) or ps -a (for all processes).
• Use the top command: The top command is used to display a real-time list of running processes. To use the top command, open a terminal and type top (without any arguments).
• Use the kill command: The kill command is used to terminate a process. To use the kill command, open a terminal and type kill <PID> (replace <PID> with the process ID of the process you want to terminate).

Graphical Interface

The graphical interface is a more user-friendly way to see the running process in Linux. Here are the steps to follow:

• Use the htop command: The htop command is a graphical process viewer that displays a list of running processes. To use the htop command, open a terminal and type htop (without any arguments).
• Use the jits command: The jits command is a graphical process viewer that displays a list of running processes. To use the jits command, open a terminal and type jits (without any arguments).

System Logs

The system logs are a valuable resource for troubleshooting issues with your Linux system. Here are the steps to follow:

• Use the journalctl command: The journalctl command is used to view system logs. To use the journalctl command, open a terminal and type journalctl (without any arguments).
• Use the log command: The log command is used to view system logs. To use the log command, open a terminal and type log (without any arguments).

Table: Common Process Information

Field	Description
PID	Process ID (the unique identifier for the process)
Name	Process name (the name of the process)
Command	Process command (the command that started the process)
Memory Usage	Memory usage of the process (in bytes)
CPU Usage	CPU usage of the process (in percent)
Start Time	Start time of the process (in seconds)
End Time	End time of the process (in seconds)

Table: Common Process Types

Process Type	Description
Background Process	A process that runs in the background and does not interact with the user
System Process	A process that is running on the system and interacts with the user
User Process	A process that is running on the user’s system and interacts with the user

Conclusion

In conclusion, seeing the running process in Linux is a crucial aspect of system administration. By using the command-line interface, graphical interface, and system logs, you can diagnose and troubleshoot issues with your Linux system. Remember to use the ps, top, kill, htop, jits, and journalctl commands to view the running process in Linux.

Additional Tips

• Use the pmap command: The pmap command is used to display process memory mappings. To use the pmap command, open a terminal and type pmap -d <PID> (replace <PID> with the process ID of the process you want to view).
• Use the lsof command: The lsof command is used to display process information, including the process ID, name, command, and memory usage. To use the lsof command, open a terminal and type lsof -i <PID> (replace <PID> with the process ID of the process you want to view).
• Use the pgrep command: The pgrep command is used to display process information, including the process ID, name, command, and memory usage. To use the pgrep command, open a terminal and type pgrep <PID> (replace <PID> with the process ID of the process you want to view).