11/29/2023 0 Comments What is ps ef commandThe example below displays all the process that are owned by user wwwrun, or postfix. When you have multiple username, separate them using a comma. Use -u option to displays the process that belongs to a specific username. List the Process based on the UID and Commands (ps -u, ps -C) ![]() In case of BSD machines, you can use ‘ps -aux’ will give the details about all the process as shown above. The following example shows the options of ps command to get all the processes. Its a commonly used example with a ps command to list down all the process which are currently running in a machine. List Currently Running Processes (ps -ef, ps -aux) To monitor and control the processes, Linux provides lot of commands such as ps, kill, killall, nice, renice and top commands. This article explains 7 practical usages of ps command and its options. Use ps command to find out what processes are running on your system. Linux is a multitasking operating system, which means that more than one process can be active at once. Those are not standard but are pretty common, and much more reliable to use than processing the output of ps.Process is a running instance of a program. In scripts, I'd recommend sticking to the POSIX syntax (avoiding optional features).Īnd for searching for processes based on some criteria including command line, use pgrep ( pkill to kill them). ps -A -o pid= -o args=īeware not all systems support the same list of fields. Standardly, you also have the option of specifying the fields you want: ps -A -o pid -o argsįor instance for just the pid and command line (technically, the list of arguments passed to the last command the process executed though on many systems, processes can also change that arbitrarily) of All processes. ![]() On some systems including older versions of Linux, the command line is truncated by the system itself, so you can't easily get it in full if it's very large. Whether ps -ef will truncate or not the command line depends very much on the system, system version and implementation and version of ps and whether the output is going to a terminal or not. The man page on your system will give you all the details of what the various flags mean. The procps ps implementation typically found on Linux-based systems tries to conciliate all those different (and often incompatible) syntaxes, the SysV one, the BSD one, and even more like from HP/UX or AIX, so supports most syntaxes excepts in the cases where one conflicts with another. a for all processes (not just the ones associated with the current terminal), u for user oriented output to include additional information, x to also include processes not associated with any terminal (Research Unix v3 where ps first appeared already had -x for that). ![]() Ps aux would be the BSD syntax, from the more academic systems based on the original version of Unix developed by AT&T research (Bell Labs). The closest POSIX equivalent would be ps -A -o user,pid,ppid,tty,time,args (missing the C (CPU) column). It's specified by POSIX but only under the XSI option (which corresponds to the X/Open specification which was an effort to bring some form of standardisation for SysV-based systems, now merged into POSIX). Or the SysV syntax if you like though ps -ef was already in SysIII in 1980. Ps -ef is the syntax to get information every process with a fuller-format listing on Unices based on AT&T's Unix Support Group (USG), the part of AT&T that was commercialising Unix. There are and have been different flavours for historical reasons.
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