01-17-2012
Quote:
Originally Posted by
admin_xor
@Corona688
Some directories in /etc are indeed restricted for root.
So? He's
not looking inside any directories.
Quote:
So there's a pretty good reason why your GUI got stuck as grep has to run a loop for each inode (that includes directories as well which is absolutely meaning less in this case).
So what? That doesn't hang the system. Linux is a
pre-emptive kernel. If a process wastes too much time, it will be stopped so something else can go. At worst grep could've lagged the system from using 100% CPU. It wouldn't
freeze it.
Back in my college days, a fellow student accidentally left behind a process which due to a bug did nothing but eat 100% CPU. Several weeks later, it was still there. Nobody noticed it until I ran 'top'. It hadn't interfered with people's use of the system at all.
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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)