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• #PS EF COMMAND IN UNIX CODE#

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.

#PS EF COMMAND IN UNIX CODE#

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: Load the config file so the environment variable gets set. The file needs to be in the home directory of the user running the command. Inside the file set an environment variable to the secret. 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 Set the permissions of the file to be read-only by owner. By default, for each process that is associated with the user's terminal, ps displays the process ID (PID), TTY, processor time used (TIME), and name of the command (COMM). 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. Description ps displays status information about processes, and optionally, the threads running under each process. 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?"