Difference between revisions of "Tips"

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= create graphs using gnuplot =
+
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[[Image:Snapshot-gnuplot-weight.png||thumb|200px|gnuplot graph (click to enlarge)]]
 
 
 
[[GnuPlot]] helps you to create graphs from data in a file. You can plot your weight, income, CPU-utilization, whatever fits into a file.
 
 
 
= want to watch a forbidden video =
 
You want to watch a video, but it is only available for viewers in the USA? See [[rackspace]].
 
 
 
= want to get rebate like an American =
 
Rental cars tend to be cheaper if you use a browser with a US IP address. To do this, see [[rackspace]].
 
 
 
= don't want this program to start everytime you log in? =
 
Sometimes a program is started when you log in, but you do not want this. To schedule and de-schedule programs from starting, see [[scheduling tasks]].
 
 
 
= want to hide your personal data in the internet =
 
If you visit a website, people will know data from you like operating system and location. To prevent this, use [[tor]].
 
 
 
= want to connect a USB drive and get instant access =
 
When you connect your USB drive you want it to be accessible somewhere immediately. You do not want to [[open a console]] and mount it, you want it to be mounted automatically. See [[automounter]].
 
 
 
= analyze system performance =
 
[[Image:Snapshot-ksar.png||thumb|200px|ksar (click to enlarge)]]
 
 
 
You can analyze system performance using [[ksar]].
 
 
 
= rename several files =
 
Rename several files using the [[command]]
 
rename 's/BEFORE/AFTER/g' *
 
 
 
= list files by size =
 
To list files ascending by size use the [[command]]
 
du -s * | sort -n
 
attention, this will not work if you have a file named ''--help''. Also, this command will not include [[hidden files]].
 
 
 
= favorite Linux-Tools =
 
history|awk '{print $2}'|awk 'BEGIN {FS="|"} {print $1}'|sort|uniq -c|sort -rn|head -10
 
 
 
= controlling several computers at once =
 
{|
 
[[image:Snapshot-cssh.png|right|thumb|200px|ClusterSSH (click to enlarge)]]
 
|}
 
 
 
When working in a [[cluster]] you can control several computers in one [http://simple.wikipedia.org/wiki/Command_Line_Interface console] using [http://sourceforge.net/projects/clusterssh/ clusterssh].
 
 
 
= find out which files are accessed by a program =
 
To find out which files are accessed by a program start it with
 
strace -e open ''program''
 
 
 
= find out program that belongs to a window =
 
Sometimes a window pops up and you do not know which program it is. For example you have just created a fresh user and when he logs in, he sees a window that you would like to get rid of. So you need to search where the window's program is called. So, every window is associated with a process. To find that out, call xprop and click on the window you want information about.
 
# xprop
 
[...]
 
WM_CLASS(STRING) = "simple-scan", "Simple-scan"
 
[...]
 
 
 
= find out where configuration changes are stored =
 
See [[find out where configuration changes are stored|here]]
 
 
 
= convert images in a batch job =
 
Use the [[command]] convert:
 
convert ''name''.''format'' ''name''.jpg
 
 
 
= did you know... =
 
 
 
== ...you can allow running vlc as root ==
 
To do this, disassemble and edit vlc as described under [[Gdb#Allow_starting_vlc_as_root]].
 
 
 
== ...you can sort files by size and age ==
 
To sort your files and folders by size, [[open a console]] and enter:
 
[[du]] -s * | sort -n
 
To sort your files and folders by age, [[open a console]] and enter:
 
[[ls]] -ltr
 
 
 
== key codes ==
 
... you can find out the key code of every key on your keyboard using the [[command]] [[xev]].
 
 
 
== split files ==
 
...you can split files using the [[command]] [[split]].
 
 
 
== put computer into standby mode ==
 
... you can put your computer into standby mode by [[opening a console]] and entering
 
echo mem > /sys/power/state
 
 
 
= Remove red eyes with The GIMP =
 
# mark the red in the eyes with the magic stick
 
# selection -> fade (5px)
 
# choose a pen
 
# mode "color", opacity 80%, one time
 
# mode "overlay", opacity 65%, one time
 
 
 
= write something on your screen =
 
...you can write something on your screen using [[osd_cat]].
 
 
 
= download youtube videos... =
 
... using http://keepvid.com/, it works with Linux.
 
 
 
= watch changes =
 
... you can watch changes, e.g. the size of a file being written with the [[command]] [[watch]]:
 
dd if=urandom.img of=test.img & watch --interval=1 "du -h test.img"
 
 
 
= See also =
 
* http://www.onpn.de/misc/linuxtipps.txt
 

Revision as of 07:04, 23 November 2015

One more thing. I believe that there are quite a few trveal insurance websites of reliable companies that let you enter your vacation details and possess you the insurance quotes. You can also purchase an international trveal cover policy online by employing your own credit card. All you need to do is to enter your own trveal particulars and you can be aware of the plans side-by-side. Simply find the package that suits your capacity to pay and needs after which it use your bank credit card to buy that. Travel insurance on the internet is a good way to perform investigation for a reputable company for international holiday insurance. Thanks for discussing your ideas.