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Top Forums UNIX for Advanced & Expert Users how to check how long the process has been running. Post 302225926 by redoubtable on Sunday 17th of August 2008 08:12:56 PM
Old 08-17-2008
ps will not help you because it gives you the CPU time. A very simple workaround for this is checking the ctime or mtime of a file created when that process began execution. As such, you can just go ahead and see the date in ls -ld /proc/PID-OF-YOUR-PROCESS.

Example:
Code:
Tsunami comparing # ls -ld /proc/1
dr-xr-xr-x 5 root root 0 2008-08-17 22:21 /proc/1
Tsunami comparing # uptime
 01:11:18 up  2:50,  5 users,  load average: 0.05, 0.06, 0.02
Tsunami comparing # date
Mon Aug 18 01:11:24 WEST 2008
Tsunami comparing #

The creation of init process (PID 1) is more or less when the system started.
 

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UPTIME(1)							   User Commands							 UPTIME(1)

NAME
uptime - Tell how long the system has been running. SYNOPSIS
uptime [options] DESCRIPTION
uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes. This is the same information contained in the header line displayed by w(1). System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a runnable state is either using the CPU or waiting to use the CPU. A process in uninterruptable state is waiting for some I/O access, eg waiting for disk. The averages are taken over the three time intervals. Load averages are not normalized for the number of CPUs in a system, so a load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time. OPTIONS
-p, --pretty show uptime in pretty format -h, --help display this help text -s, --since system up since, in yyyy-mm-dd HH:MM:SS format -V, --version display version information and exit FILES
/var/run/utmp information about who is currently logged on /proc process information AUTHORS
uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson <johnsonm@sunsite.unc.edu> SEE ALSO
ps(1), top(1), utmp(5), w(1) REPORTING BUGS
Please send bug reports to <procps@freelists.org> procps-ng December 2012 UPTIME(1)
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