ps：process status
for pid in $(pgrep httpd); do echo -n "${pid} " ; ps -p ${pid} -o lstart | grep -v "START" ; done
ps -eo pid,lstart,etime,cmd | grep nginx
lstart STARTED time the command started. See also bsdstart, start, start_time, and stime.
etime ELAPSED elapsed time since the process was started, in the form [[DD-]hh:]mm:ss.
