Commands using sleep

If you are on your bed, waching a movie or if you are downloading something, but you whant to sleep. You can use these easy command to power off after X time. The time is in sec. if you whant to wait 1 H, use:

sleep 3600; poweroff

This will cause their computer to make a beeping sound after a random amount of time until it is killed.

Used in OS X.

tr "\n" ";"

may be replaced by

echo ";"

with linux versions of date.

I reused

ping -q -c 1 www.google.com|tail -1|cut -d/ -f5

The closer to zero the better.Credit to TheSeb on macrumors: http://forums.macrumors.com/showthread.php?t=1289884

This command is good for a cron job or where you may have a lot of jobs potentially coincide on a scarce resource (like writing files back to a file server all at once). This will insert a sleep of a random amount of time up to an hour.

for OS X

Execute a process or list of commands in the given interval and output the difference in output.

rather don't depend on those sleepin'pills

http://en.wikipedia.org/wiki/Counting_sheep

Case insensitive. Also you can pull in the songs from a blacklist, one per line -

while :; do (mpc current | grep -i -f blacklist.txt && mpc next); sleep 5; done

http://www.joachim-breitner.de/projects#screen-message now also supports reading stdin continuously to update what it shows, different ?slides? separated by a form feed character. Here, we feed the current time into it each second to create a large clock.

Ssh to your co-worker's box and watch them go crazy when the cd player ejects

Actually this is a shorter version that fits the 255 chars limit of this resource. The full version shows status in the right top corner:

mpc is defined like this:

function mpc() {

echo "$*" | nc 192.168.1.1 6600

}

pauses exactly long enough to wake at the top of the hour

Watch file's contents that is getting overwritten

This creates a permanent stock ticker in the terminal. it has scrolling action and refreshes when each cycle is done to get the latest news.

Cleaned up and silent with &>/dev/null at the end.

Execute commands serially on a list of hosts. Each ssh connection is made in the background so that if, after five seconds, it hasn't closed, it will be killed and the script will go on to the next system.

Maybe there's an easier way to set a timeout in the ssh options...

This puts a clock in the top right of the terminal. This version doesn't use tput, but uses escape codes

Using the output of 'ps' to determine CPU usage is misleading, as the CPU column in 'ps' shows CPU usage per process over the entire lifetime of the process. In order to get *current* CPU usage (without scraping a top screen) you need to pull some numbers from /proc/stat. Here, we take two readings, once second apart, determine how much IDLE time was spent across all CPUs, divide by the number of CPUs, and then subtract from 100 to get non-idle time.