Getting the uptime of a SunOS UNIX box in seconds only

问题

How do I determine the uptime on a SunOS UNIX box in seconds only?

On Linux, I could simply cat /proc/uptime & take the first argument:

cat /proc/uptime | awk '{print $1}'

I'm trying to do the same on a SunOS UNIX box, but there is no /proc/uptime. There is an uptime command which presents the following output:

$ uptime
12:13pm  up 227 day(s), 15:14,  1 user,  load average: 0.05, 0.05, 0.05

I don't really want to have to write code to convert the date into seconds only & I'm sure someone must have had this requirement before but I have been unable to find anything on the internet.

Can anyone tell me how to get the uptime in just seconds?

TIA

回答1:

If you don't mind compiling a small C program, you could use:

#include <utmpx.h>
int main ( )
{
  int nBootTime = 0;
  int nCurrentTime = time ( NULL );   
  struct utmpx * ent;

  while ( ( ent = getutxent ( ) ) ) {
    if ( !strcmp ( "system boot", ent->ut_line ) ) {
      nBootTime = ent->ut_tv.tv_sec;
    }      
  }   
  printf ( "System was booted %d seconds ago\n", nCurrentTime - nBootTime );    
}

Source: http://xaxxon.slackworks.com/rsapi/

回答2:

This is a mix of some answers already given. Outputs uptime in seconds with only two commands. Tested on Solaris 9 and 10.

kstat -p unix:0:system_misc:boot_time | nawk '{printf "%d\n", srand()-$2}'

回答3:

A rather unorthodox method might be this (helped me out since the kstat yielded some weired results that did not pass cron:

RunTime=""
RunTime=`kstat -p unix:0:system_misc:snaptime | awk '{print $2}' | cut -d "." -f1`
echo $RunTime
RunTime=`expr $RunTime / 1`
RunDays=`expr $RunTime / 86400`
RunHours=`expr $RunTime % 86400 / 3600`
RunMinutes=`expr $RunTime % 3600 / 60`
RunSeconds=`expr $RunTime % 60`

Hope it helps you out - Nice side effect: You have the time bits available for calculations.

回答4:

Thanks to Andre for a solution that will provide seconds. If anyone is looking for an answer without compiling, this script can be used. Note, as the "uptime" command does not provide seconds the solution is anything from 0 to 59 seconds out when it is run:

days=`uptime | awk '{print \$3}'`
hrs=`uptime | awk '{print \$5}' | sed 's/[:,]/ /g' | awk '{print \$1}'`
mins=`uptime | awk '{print \$5}' | sed 's/[:,]/ /g' | awk '{print \$2}'`
uptimesecs=$(($mins*60))
uptimesecs=$(($hrs*3600+$uptimesecs))
uptimesecs=$(($days*86400+$uptimesecs))
echo "$uptimesecs seconds uptime (to within 59 secs)."

Hope that's of use to someone :-)

回答5:

Perl: CPAN provides unix::uptime - however, it is not currently compatible with SunOS but may be in the future.

回答6:

Here is a shell script that provides second resolution. Note that you need to be root for it to work.

#!/bin/ksh
now=$(nawk 'BEGIN{print srand()}')
i=$(apptrace -fv 'getutxent' uptime 2>&1 | grep time_t | tail +2 | head -1 | nawk '{print $3}')
ut=$(bc <<-%EOF%
ibase=16
$(print $i | sed 's/0x//' | tr "[a-f]" "[A-F]")
%EOF%
)
s=$((now-ut))
h=$((s/3600))
s=$((s-(h*3600)))
m=$((s/60))
s=$((s-(m*60)))
d=$((h/24))
h=$((h-(d*24)))
printf "%d seconds - %d day(s) %02d:%02d:%02d\n" $((now - ut)) $d $h $m $s

回答7:

You can use kstat to find the system uptime.

$kstat -p unix:0:system_misc:boot_time

This will return the values in unix format. Below is the code which was very useful for me to get the values in sec.

#!/usr/bin/perl -w
use strict;

my $KSTAT = '/usr/bin/kstat -p';
my $STATISTIC = 'unix:0:system_misc:boot_time';

my $uptime = `$KSTAT $STATISTIC | awk '{print \$2}'`;
sprintf "%0.2f\n", (time() - $uptime);

回答8:

Use truss to extract the creation time of the directory /proc/0. (Must be run as root.)

#!/bin/bash

btime=$(truss -v lstat -t lstat ls -ld /proc/0 2>&1 | awk '/ct = /{print $9}' | cut -d. -f1)

回答9:

Use truss on the date command to get epoch time and subtract boot time obtained from kstat.

expr `truss date 2>&1 |grep '^time()' |tr -cd "[0-9]"` - `kstat -p unix:0:system_misc:boot_time|cut -f2`

来源：https://stackoverflow.com/questions/1661006/getting-the-uptime-of-a-sunos-unix-box-in-seconds-only

标签

unix

shell

uptime

sunos