12/4/2023 0 Comments Ps ef command in linuxWhere 3rd column indicates start time sonce. Output will be process name and process Id. Know which process is using a particular file. You will be able to see all files opened by the process. Step 2 : Now execute below command #ls -ltr /proc//fd/* ![]() Or #ps -ef | grep osi | grep -v grep | awk '' | head -1 Then execute lsof -i command #lsof -i | grep įifth column in the output will show whether its listening on ipv4 or ipv6.įind files used/opened by a particular process Step 1 : # First find pid of process #ps -ef | grep Example of ps Command psĢ764 pts/1 00:00:00 Some Other Common Example How to find whether java application is listening on IPv4 or IPv6 There are several other character combinations that indicate a background process see this for a listing.įWIW: This works on my Debian-based system (reported as version ps from procps-ng 3.3.15), and in macOS 10.15 (which is descended from the BSD version of ps).Ps( process) command in linux is used to report the active process status. A background process may be listed with an S in the first character position, and nothing in the second position. S interruptible sleep (waiting for an event to complete)Ĭonsequently, we see from the + in the second character position that this process is running in the foreground. There is one more step required to learn if this process if foreground or background: The state value of S+ must be decoded in man ps under the heading of PROCESS STATE CODE - which tells us: the command that spawned the process was ping 8.8.8.8.the process state is S+ (via keyword stat).In another terminal: ps -eo pid,stat,command | grep ping | grep -v grep In one terminal, run this command: ping 8.8.8.8 > /dev/null ![]() To see how this works, consider this example: ![]() A process is associated with any program running on your system, and is used to manage and monitor a program’s memory usage, processor time, and I/O resources. But note that while all three of these keywords will provide state in the output, only the stat keyword will give the multi-character process state! The take-away: ps favors the diligent user.Īs an example, the following ps command will output the PID, the state, and the command that started the process using the keywords pid, stat and command: ps -eo pid,stat,command The ps aux command is a tool to monitor processes running on your Linux system. These keywords are listed in the STANDARD FORMAT SPECIFIERS section, and with extraordinary persistence one will eventually find the s, stat and state keywords listed. 2 Answers Sorted by: 4 Your grep filters out the relevant part of the output of ps: ps -ef head ps -ef fgrep init should get you: UID PID PPID C STIME TTY TIME CMD root 1 0 0 Feb13 00:00:01 /sbin/init have a look at man ps for an explanation of the column contents. Ps -ef doesn't report process state, but referring to man ps we find in the OUTPUT FORMAT CONTROL section that the -o argument may be used to specify the output of ps via one or more keywords. man ps lists these process states under the heading of PROCESS STATE CODE. The foreground and background status of a process are reported by ps as the state of the process. how I can know if the process is running background or foreground?"
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