ls -ld /proc/PID
That's returning the creation date of the proc files from the process. Some users reported that this way might show you a wrong date since any other process like cron, for example, could change this date.
[root@server ~]# ps -ef | grep [2]8144 root 28144 1 0 Jun16 ? 00:00:00 /opt/omni/lbin/bsm -session_key 25 -owner root root server 28142 4294967295 -lang C -read SmOptions_28142_server_615 [root@server ~]# ps -eo pid,lstart,cmd | grep [2]8144 28144 Sun Jun 16 23:00:01 2013 /opt/omni/lbin/bsm -session_key 25 -owner root root server 28142 4294967295 -lang C -read SmOptions_28142_server_615
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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