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ps -ef中的e、f是什麼含義

linux或mac控制檯下輸入ps -ef | grep 關鍵字可以檢視是否有相應的程序啟動資訊中包含關鍵字。如:
在這裡插入圖片描述

ps的意思是process status,即程序狀態。在控制檯執行man ps命令可以檢視ps命令後面的命令選項的含義如下:

     The options are as follows:

     -A      Display information about other users' processes, including those without controlling ter-
             minals.

     -a      Display information about other users'
processes as well as your own. This will skip any processes which do not have a controlling terminal, unless the -x option is also specified. -C Change the way the CPU percentage is calculated by using a ``raw'' CPU calculation that ignores ``resident'' time (this normally has no effect)
. -c Change the `
`command'' column output to just contain the executable name, rather than the full command line. -d Like -A, but excludes session leaders. -E Display the environment as well. This does not reflect changes in the environment after process launch. -e Identical to -A. -f Display the uid, pid, parent pid, recent CPU usage, process start time, controlling tty, elapsed CPU usage, and the associated command. If the -u option is also used, display the user name rather then
the numeric uid. When -o or -O is used to add to the display follow- ing -f, the command field is not truncated as severely as it is in other formats. -G Display information about processes which are running with the specified real group IDs. -g Display information about processes with the specified process group leaders. -h Repeat the information header as often as necessary to guarantee one header per page of information. -j Print information associated with the following keywords: user, pid, ppid, pgid, sess, jobc, state, tt, time, and command. -L List the set of keywords available for the -O and -o options. -l Display information associated with the following keywords: uid, pid, ppid, flags, cpu, pri, nice, vsz=SZ, rss, wchan, state=S, paddr=ADDR, tty, time, and command=CMD. -M Print the threads corresponding to each task. -m Sort by memory usage, instead of the combination of controlling terminal and process ID. -O Add the information associated with the space or comma separated list of keywords speci- fied, after the process ID, in the default information display. Keywords may be appended with an equals (`
=') sign and a string. This causes the printed header to use the speci- fied string instead of the standard header. -o Display information associated with the space or comma separated list of keywords speci- fied. Multiple keywords may also be given in the form of more than one -o option. Key- words may be appended with an equals (`=') sign and a string. This causes the printed header to use the specified string instead of the standard header. If all keywords have empty header texts, no header line is written. -p Display information about processes which match the specified process IDs. -r Sort by current CPU usage, instead of the combination of controlling terminal and process ID. -S Change the way the process time is calculated by summing all exited children to their par- ent process. -T Display information about processes attached to the device associated with the standard input. -t Display information about processes attached to the specified terminal devices. -U Display the processes belonging to the specified real user IDs. -u Display the processes belonging to the specified usernames. -v Display information associated with the following keywords: pid, state, time, sl, re, pagein, vsz, rss, lim, tsiz, %cpu, %mem, and command. The -v option implies the -m option. -w Use 132 columns to display information, instead of the default which is your window size. If the -w option is specified more than once, ps will use as many columns as necessary without regard for your window size. When output is not to a terminal, an unlimited number of columns are always used. -X When displaying processes matched by other options, skip any processes which do not have a controlling terminal. -x When displaying processes matched by other options, include processes which do not have a controlling terminal. This is the opposite of the -X option. If both -X and -x are speci- fied in the same command, then ps will use the one which was specified last.

可見
-e-A的意思是一樣的,即顯示有關其他使用者程序的資訊,包括那些沒有控制終端的程序。
-f顯示使用者id,程序id,父程序id,最近CPU使用情況,程序開始時間等等。