![]() ![]() Those are not standard but are pretty common, and much more reliable to use than processing the output of ps. 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). Here is the type of output I am after: B ps -ef. ps -A -o pid= -o args=īeware not all systems support the same list of fields. Can anyone help I am trying to follow these procedures. 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. 1 it is probably used to find out processes whose binaries/scripts are located in (or underneath) the current directory. 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). Let’s see the basic working of the ps -ef command by executing the script: ps -ef The output shows a list of processes. The closest POSIX equivalent would be ps -A -o user,pid,ppid,tty,time,args (missing the C (CPU) column). The ps -ef command displays a list of processes, with each process occupying one line. It also causes the command arguments to be. 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). This option can be combined with many other UNIX-style options to add additional columns. 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. TIME: Total CPU time used by the process since it. There are and have been different flavours for historical reasons. Using the ps command Column: Value Is: C Recently used CPU time for the process (in units of clock ticks). The options described here will cater for most commonplace needs. If you need to go deeper into ps than we've taken it in this article, you'll find that our introduction makes the man page easier to digest.Ps is a very system-dependant command. Ps is flexible enough to give you precisely the information you need in exactly the format you'd like it. In fact, ps has a great many options. It gives you a snapshot of what is happening inside your computer "right now." The ps command satisfies both of these needs. Perhaps you're just curious about which processes are running inside your computer, and you'd like to peek beneath the hood. ![]() Of course, is to identify the process in question.īut maybe you don't have any task or performance issues at all. Sometimes tasks need to be killed as a mercy to everyone involved. Or they may continue running, but gobble up too much CPU time or RAM, or behave in some equally anti-social way. Sometimes tasks can lock-up, or enter a tight loop, or become unresponsive for other reasons. ![]()
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