I can change the tabs in firefox by using Alt + 2 or Alt + 3 or alt + 4 etc. I accidentally found today that Window key + 2 can be used to zoom in! Window key + 1 is for Normal screen size.

>> 24685316 kb in MB
shows the wrong results:
24 685 316 kilobits = 3 013.34424 megabytes

I should have typed KB in capital to find the correct MB count

>> 24685316 KB in MB
24 685 316 kilobytes = 24 106.7539 megabytes

(Note the spelling difference in kilobits and kilobytes!)

Changing the -e to -i in the following can be disastrous. It will replace the character "g" from all text files found in current directory as well as subfolder.

$ find . -name "*.txt" -exec sed -e 's/g//g' {} \;

Be careful with sed's -i option

___

It can also be very useful to change a string across all files...

select.worldpay.com/wcc/purchase

replace this with the new string

select.wp3.rbsworldpay.com/wcc/purchase/

The command would be...
grep 'select.worldpay.com/wcc/purchase' . -Rl | xargs sed -i 's/select.worldpay.com\/wcc\/purchase/select.wp3.rbsworldpay.com\/wcc\/purchase/g'

If you need to know the 3 days old date, it easy in shell.

$ v_prev_date=`date --date='3 days ago' +%Y%m%d`

$ echo $v_prev_date
20090808

I was looking for the file translate.html from my backup drives, e: and f:
Since it was taking some time on Windows system, I stared the live session of Ubuntu and used the following command after touching both the drives from "Places" menu.

find /media/ -name translate.html

Very fast and accurate results!

perl -pe '$_ = "$. $_"'

“-p” causes Perl to assume a loop around the program (specified by “-e”) that reads each line of input into the ” $_ ” variable, executes the program and then prints the ” $_ ” variable. In this one-liner I simply modify ” $_ ” and prepend the ” $. ” variable to it. The special variable ” $. ” contains the current line number of input.
The result is that each line gets its line number prepended.

The root account is disabled by default on Ubuntu installations, mainly to prevent you from doing something you didn’t intend to do.
You can enable root account as follows:

1. Type sudo passwd root and provide a root password.
2. Then head on over to System > Administration > Login Window, go to the Security tab and check “Enable local system administrator login”

You should now be able to login as root from the Login prompt. As an alternative you can use “sudo su” to provide your password and get root prompt.

You can make Ubuntu remember the applications you had open when you last logged out, so that when you log back in again you’ll find all those applications running and you can resume right from where you left off.

To achieve this go to System > Preferences > Startup Applications, then go to the options tab and check “Automatically remember running applications when logging out”

Just create a regular .PHP file, where you output your data in a nice little html-table. Then place the following snippet in the top of that file:

header("Content-type: application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=excel.xls");

And it’s just that easy. If you open the page, you’ll see a download-window asking you where to place the file.

You can set Gmail as Default Email Client in Firefox

* go to Tools > Options
* select the Applications tab
* search for mail
* select Use Gmail from the list of actions associated with the mailto protocol
* click OK to save the settings.