Linux Commands Examples

A great documentation place for Linux commands


delay for a specified amount of time



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How do I make Ubuntu resume from suspend mode by pressing a key on the keyboard?

Is it a USB keyboard? Maybe this thread at Ubuntu Forums can help.


Put a Windows computer to sleep remotely (from a Linux box)


You can use the net rpc shutdown -I x.x.x.x -U username%password command from linux (I think - it works under XP).

I had to install my distribution's samba package to get the net command. You'll have to enable remote shutdown on your windows box too. Have a look at how to do it in xp. You might have to add a few parameters if you want to put your win box to sleep instead of shutting down though.


Fedora 18 Disable Hibernate and Suspend

The problem with the latter approach for F17 and earlier was that the file might be overwritten when upower is updated, but even that would be acceptable.

U can protect those files from overwriting by setting 'i' attribute (chattr +i /path/to/file), doing this as root of course.


Dell Dimension running Fedora12 does a "Sleeping Beauty" and I am not a "handsome prince"!

Problem Solved: First, quack quixote thank you for your edit. I looked at your profile and we older geeks sometimes have an advantage. I am 2 months shy of the US National Speed Limit - 70. I have worked on computers in some fashion since age 18.

Two machines with almost identical symptoms but they had different problems. Both were hardware and not fedora. The one that I posted over had a "soft memory bit." For those that do not know, soft bits are those that only fail only when stressed. Apparently, slide show screen savers can do that.

Machine two had a ram memory boundary problem. Specifically, memory strips with different megahertz rating. That machine was diagnosed as having a heat problem by a local tech at a remote office, replaced, and shipped to me. I never looked at the memory strips, I simply cleaned the machine, did rudimentary testing, and put it on the shelf. It remained there until I decided to put Fedora on it.

Maybe I will go home, look in the mirror and see if I have turned into a "Handsome Prince" after all.

Naw! Never happened. I am still just a crusty old geezer geek.


Put 'nix box to sleep from command line?

/etc/acpi/ or pm-suspend.


Windows won't sleep after booting from grub

I'm seeing a similar problem with Windows 8 and Ubuntu 12.04, but both OSes are installed onto the same HDD in different partitions.

If the Windows partition is active, shutdown works as expected.

If I make the Ubuntu partition active, and boot Windows 8 via grub, I can't shutdown (the screen turns black, and the HDD LED flickers for a bit, but the WiFi LED remains lit. If I touch a key or the trackpad, the screen wakes up, and I'm back into the Windows lock screen.

Interestingly, using the Windows "shutdown /s" command works, even when booting via grub.


Is there a way to automatically prevent sleeping during the day in Linux?

You didn't specify Gnome, KDE, or other, but if you're using Gnome and you extract the meat of this post then use it via a cron job, you should get what you want.

Essentially you're using the gnome-screensaver-command --poke to reset the idle timer. If you're not familiar with cron, take a look at this page. The cron line will depend a bit on your sleep timeout settings, but would be similar to (untested):

0 7-18 * * * marten gnome-screensaver-command --poke

...which would run the command on the hour between 7am and 6pm, as user 'marten'.


Need better management of display sleep times in Fedora 17. How to do?

Use a video player which disables the screen saver and display power management while playing video. An example of such a video player would be vlc. When it's playing, the screen will not turn off nor start a screensaver, even if the video is paused.


How do I prevent Ubuntu from putting my monitor to sleep?

Check System>Preferences>Screensaver and see if "Activate screensaver when computer is idle" is checked.

Also, if you hit Alt + F2 and enter gconf-editor then navigate to /apps/gnome-power-manager/lock you can see if blank screen is checked.


Recover an application in sleeping state after an X server crash

Not without some prior preparation. There are proxy Xservers, such as XMX or xmove that would allow you to reconnect the proxy to a new Xserver in theory, thus when the displaying Xserver crashes, you can migrate to a new one, but they do have their limitations. XMX is designed for screencasting of a sort, and xmove is designed for user-initiated migration, not recovering from a crashed Xserver.

There are also applications like Xpra, and Xvnc that would allow you to run a second Xserver that does not display to the screen, then "attach" to those Xservers from another Xserver, thus if your displaying Xserver crashes, you can simply reattach.

Finally, there was a utility Guievict that used runtime code patching to migrate an application without its consent to another Xserver, but I find it doubtful that that would work in a modern environment.



Pause for NUMBER seconds. SUFFIX may be ’s’ for seconds (the default), ’m’ for minutes, ’h’ for hours or ’d’ for days. Unlike most implementations that require NUMBER be an integer, here NUMBER may be an arbitrary floating point number. Given two or more arguments, pause for the amount of time specified by the sum of their values.


display this help and exit


output version information and exit


Copyright © 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

reporting bugs

Report sleep bugs to bug-coreutils[:at:]gnu[:dot:]org
GNU coreutils home page: <>
General help using GNU software: <>
Report sleep translation bugs to <>

see also


The full documentation for sleep is maintained as a Texinfo manual. If the info and sleep programs are properly installed at your site, the command

info coreutils 'sleep invocation'

should give you access to the complete manual.


Written by Jim Meyering and Paul Eggert.

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