Process Attributes

• PID or process ID, an integer.
• PPID or parent process ID, an integer.
• Nice number, the degree of friendliness of the process towards other processes (process priority is calculated from nice numbers and recent CPU usage).
• TTY, the terminal to which the process is connected.
• RUID, or real user ID. The user issuing the command.
• EUID, or effective user ID. The one determining access permissions to system resources.
• RGID, or real group owner. The group of the user who started the process.
• EGID, or effective group owner. Different from RGID when SGID has been applied to a file.