How to Get Detailed Process Information from a PID in Bash?

Getting Process Details from Its PID

In the realm of system monitoring, retrieving details about running processes is essential. If you have a list of process IDs (PIDs) and intend to extract information about each process, the Go syscall.Getrusage() method may not provide the desired results. Let's explore an alternative approach.

The Bash command ps -p $PID (where $PID is replaced with the actual process ID) is a versatile tool for gathering process details. By default, it returns the following information:

• PID: The process ID
• TTY: The controlling terminal name (if applicable)
• TIME: CPU time used by the process
• CMD: The command that invoked the process

To retrieve more detailed information, use the -o options flag. For instance, the following command provides the process's full command with arguments, user, group, and memory usage:

ps -p $PID -o pid,vsz=MEMORY -o user,group=GROUP -o comm,args=ARGS

Remember to place the args option at the end to prevent command truncation due to differing output lengths.

This approach enables you to conveniently gather process details using a simple and straightforward command.

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