Add or modify Text to the PDF in Adobe Acrobat

To add or edit text to a PDF file using the Adobe Acrobat, select "Tools->Advanced Editing->Touchup Text Control", Now select some text to modify, a rectangle will appear, and one can begin typing text, or modify the font by right -click the selected text and select "Properties".

To add a signature or draw something on PDF, select "Tools->Drawing Markups->Pencil Toos"

Screen Sharing Free Tool

https://www.join.me/?BoxUrl=https%3A%2F%2Fsecure.join.me%2FBigIdea%2FShareJoin%2FPages%2FShareJoin.aspx&ReturnUrl=https%3A%2F%2Fsecure.join.me%2Ffederated%2Floginsso.aspx&TrackingUniqueId=3c3677ce-69b0-4761-b60e-aa7fc984511b

How to collapse all projects in the solution explorer of visual studio

The following link contains the visual studio extension which allows one to collapse the projects in the solution explorer of the visual studio. Very useful if a solution contains  a lot of projects:

https://visualstudiogallery.msdn.microsoft.com/cb0ec47d-05a4-40a7-ba39-9a2da6492f1c/

Setup and run FTP Server on Unbuntu 14.04 LTS

https://www.digitalocean.com/community/tutorials/how-to-set-up-vsftpd-on-ubuntu-12-04

Simply run the following commands to install vsftpd:

> sudo apt-get install vsftpd

Run the following commands to open the vsftpd.conf for editing:

> sudo gedit /etc/vsftpd.conf

In the vsftpd.conf, uncomment the following line:

anonymous=NO
local_user=YES
write_enable=YES
chroot_local_user=YES

Save and close vsftpd.conf and change the root folder:

> sudo chown root:root $HOME

Now restart the vsftpd:

> sudo service vsftpd restart

Disable internal keyboard of a laptop running on Ubuntu 14.04 LTS

Recently I need to use a very old laptop, which happens to have some of its internal keyboard damaged, i attached an external keyboard via usb but the internal keyboard keeps interfere with the terminal input and the GUI (possibly due to malfunction that causes some keys to be pressed permanently). Therefore, I decided to disable the internal keyboard of the laptop, and now everything works wonderfully. The way to do this is as following:

1. Open a terminal, and run the following command:

> xinput list

2. Take note of the id in the line that reads "AT Translated Set 2 Keyboard", in my laptop it is 14. Now run the following command to disable it:

> xinput float 14

By the way, to re-enable run "xinput reattach 14".

Free tool for file conversion between PDF, Tex, Word and so on

pandoc (Download from http://johnmacfarlane.net/pandoc/index.html)

A set of tools useful for network analysis on Windows OS

Traceroute: trace network to network hopping to the destination host
(Enter tracert command on Windows console)

wget: fetch contents from network
(Download from http://gnuwin32.sourceforge.net/packages/wget.htm)

cUrl: fetch contents from network
(Download from http://curl.haxx.se/dlwiz/?type=bin&os=Win32&flav=-&ver=2000%2FXP)

Wireshark: trace the protocol layering, packet, data frames when contents are transmitted from the local machine to hosts on the network
(Download from http://www.wireshark.org/download.html)