In this tutorial,we will learn about 4 different commands to find system uptime in linux.Uptime of system means how long the server has been running and up since its last shutdown or reboot.The information about uptime is very useful in many cases it helps to audit how long the server is running and even some system admin use the uptime commands in scripts for thier task. May 4, 2018 - Apostila Ingles Uptime Command; - Protek Service Manual; - Rpg Maker Vx Ace Modern Tilesets Free Download; - Contrabajeando.
. About uptime uptime tells you how long the system has been running. 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. the system averages for the past 1, 5, and 15 minutes. This is the same information contained in the line displayed. System load averages is the average number of that are either in a runnable or uninterruptible state. A process in a runnable state is either using the or waiting to use the CPU. A process in uninterruptible state is waiting for some access, eg waiting for.
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 75% of the time. Uptime syntax uptime options Options -h, -help Display a brief help message, and exit.V, -version Display version information, and exit.
Files /var/run/utmp Information about who is currently logged on. /proc Process information.
Uptime examples uptime Displays system uptime information. Output will resemble the following: 08:11:22 up 146 days, 34 min, 3 users, load average: 0.28, 0.45, 0.38 Below is a breakdown of what the above output means. 08:11:22 up 146 days, 34 min 3 users load average: 0.28, 0.45, 0.38 Current time The actual up time. How many users logged in The average Related commands — Report the status of a process or processes. — Display a sortable, continually-updated list of processes.
— Show who is logged on and what they are doing.
In this tutorial,we will learn about 4 different commands to find system uptime in linux.Uptime of system means how long the server has been running and up since its last shutdown or reboot.The information about uptime is very useful in many cases it helps to audit how long the server is running and even some system admin use the uptime commands in scripts for thier task. Jim booted the linux system long days ago and now he would like to know since how many days the system is up and running. As per his assumption he booted the server around 6 months ago but he astonished to find out that server uptime was showing only one month.So it means in this period the server was rebooted. The reboot can be of many reasons either hardware failure, power trip,any script or mistake by any super user etc.Now Jim has to find out the reason but one thing is clear system was rebooted.
Below are the 4 ways to find out uptime of system. Command 1: uptime In below output it shows system is up 8 minutes ago.:$ uptime 20:43:50 up 8 min, 2 users, load average: 0.94, 0.82, 0.48:$ Command 2: cat /proc/uptime The first number is how long the system has been up(in seconds).
The second number is how much of that time the machine has spent idle(in seconds):$ cat /proc/uptime 12.92:$ Command 3: w:$ w 20:59:09 up 23 min, 2 users, load average: 0.46, 0.60, 0.58 USER TTY FROM IDLE JCPU PCPU WHAT linux tty7:0 20:40 23:03 42.68s 0.27s gnome-sessi linux pts/0:0 20:43 0.00s 0.07s 0.00s w:$ Command 4: top. Worth noting (from Red Hat site): The first value represents the total number of seconds the system has been up. The second value is the sum of how much time each core has spent idle, in seconds. Consequently, the second value may be greater than the overall system uptime on systems with multiple cores.
That would explain why after some 16 minutes after reboot (most of them idle), the 2nd /proc/uptime value reported is roughly 4X the actual uptime in a 4 core machine: /var/log$ cat /proc/uptime 9.35.