If you want a repetitive update of the selection and the displayed information, use top instead. Ps stands for ‘Process Status’ and displays information about a selection of the active processes. Command: Command used to activate the process.TIME+: Total CPU time consumed by the process.So the 1st method ( ps ef) is BSD style and the manual page goes on with. 3 GNU long options, which are preceded by two dashes. 2 BSD options, which may be grouped and must not be used with a dash. %MEM :Percentage of RAM used by the process. This version of ps accepts several kinds of options: 1 UNIX options, which may be grouped and must be preceded by a dash.%CPU: Percentage of CPU used by the process.SHR: Amount of memory shared with other processes.RES: Amount of physical memory used by a process.VIRT: Amount of virtual memory used by a process.PR: Priority given to a process while scheduling.PID: Unique Process ID given to each process.Press Ctrl-c which will send a kill signal to any process running in foreground, terminating it immediately or press Ctrl-z to send a suspend signal to any process running in the foreground, pausing it immediately. SYNTAX: $ &Įxample for foreground and background process: $ ls pwdĭuring the execution o above command, no other processes can be run or started as the prompt would not be available. For example ,system scanning using antivirus.Īny command can be run as a background process by typing a space and ‘&’ after the command.It is also referred as non-interactive process.Unlike foreground processes, when a background process has been executed you don’t have to wait for its completion to execute some other command. It runs in the background and usually do not need user input.For example, MS Office power point, Word etc.ps shows processes and doesn't care about programs (except when it lists the executable file associated with the process in the CMD or COMMAND column). It is also referred as interactive process. You may be confusing processes, which are running programs, with executable files, also called programs, which exist in storage.It runs on the screen and needs user input, hereafter you have to wait for its completion before being able to enter a new command.File Permission and File Security in Unix
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