Knowing the PID allows you to kill a malfunctioning process Usually, when running the ps command, the most important information the user is looking for is the process PID. The four columns are labeled PID, TTY, TIME, and CMD. The output includes information about the shell ( bash) and the process running in this shell ( ps, the command that you typed): PID TTY TIME CMD In it’s simplest form, when used without any option, ps will print four columns of information for minimum two processes running in the current shell, the shell itself, and the processes that run in the shell when the command was invoked. GNU long options, preceded by two dashes.ĭifferent option types can be mixed, but in some particular cases, conflicts can appear, so it is best to stick with one option type.BSD style options, used without a dash.
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