Report on active processes. ps has three types of options. GNU long options start with two hyphens, which are required. BSD options may be grouped and do not start with a hyphen, while Unix98 options may be grouped and require an initial hyphen. The meaning of the short options can vary depending on whether or not there is a hyphen. In options, list arguments should either be comma-separated or space-separated and placed inside double quotes. In comparing the amount of output produced, note that e prints more than a and l prints more than f for each entry.
Include only specified processes, which are given in a space-delimited list.
Include only specified session IDs, which are given in a space-delimited list.
As a, list all processes on a terminal. As -a, list all processes except session leaders and processes not associated with a terminal.
As -c, show different scheduler information with -l. As c, show the true command name.
Select by command name.
Set the output width (the number of columns to display).
Select all processes except session leaders.
Select all processes.
Include environment information after the command.
As -f, display full listing. As f or --forest, display “forest” family tree format, with ASCII art showing the relationships.
Set extra-full format; implies -f.