Mind maps Day 03: "Safe colors combinations", "Universal design for learning (UDL)"

Fig. 1: Colour combinations for text and background. 

Fig. 2: Universal design for learning (UDL)

Fig. 3: 216-Web-Safe Colours [1].

Fig. 4; Another web safe colours map [2].

Fig. 5: Web safe colours with names [3].

References
[1] 216-Web-Safe Colours (Essex Acorn User Group) http://www.eaug.org.uk/216clr.htm
[2] http://www.1066internet.co.uk/images/photos/web-safe-colours.jpg
[3] Brian Lawler, "Web-safe colors – time to move on!".http://thelawlers.com/Blognosticator/?p=122

Mind maps Day 02: "Example Job Interview Questions", "Unit Time Allocation"

References:

http://www.biggerplate.com/mapImages/xl/03e0ea5c-52dc-4236-b044-365bd47764ae.png

Mind maps Day 01: "Time of the day", "Why reading theAge", "Agenda"

The above mind maps were created by using a tool at www.mindmup.com.

UNIX/Linux/Ubuntu system administration DAY 06

Using Vi editor

Vi editor can be in three different modes at a given time.

Command mode: accept commands which are often entered as single letters.

Ex mode: to manipulate files (including savving file and running outside programs. Typing a colon (:) will enter the ex-mode and entering the name of the command. After running the ex-mode, it will automatically return to command mode.

Insert mode: we can enter text in this mode. Presssing Esc key will exit insert mode and returns to command mode. Typing i or a will enter insert mode when in command mode.

Popular Vi commands

When in insert mode

O (letter O) will open a new line immediately below the currnt line.

When in command mode

u will undo any change

o (a lowercase letter O) will open text

~ (tilde) will change case (e.g. a -> A)

/keyword will search forward for text matching keyword.

:q! will end an editing session without saving the modified contents.

:w filename will save the file with the given filename.

l (ell) key and the RIGHT ARROW key will move the cursor forward one character at a time.

h key and the LEFT ARROW key will move the cursor backward one character at a time.

b key will move the cursor backward by a word.

w key will move the cursor forward by a word.

Capitals B and W will jum backward and forward by blank delimited words.

ENTER key will move the cursor to the beginning of the next line.

j and DOWN ARROW key will move the cursor down one line to the character just below the current character.

k and UP ARROW key will move the cursor up one line to the character just above the current character.

x key will delete the current character.

References

[1] Roderick W. Smith, Linux essentials, Sybex, 2012.

UNIX/Linux/Ubuntu system administration DAY 05

Information about CPU

$lscpu :displays information about CPU e.g. architecture, CPU op-modes, Byte order, CPU(s), thread(s) per core, core(s) per socket, vendor id, CPU family, Model, Model name, stepping, CPU MHz, BogoMIPS, Hypervisor vendor, L1d cache, L1i cache, L2 cache, L3 cache, etc.

$cat /proc/cpuinfo more information about CPU

Chipset, which is one or more chips that provide key functionality for the computer, handles the hard disk interfaces, the USB interfaces, the network devices, etc [1].

Information about Motherboard

$lspci :displays information about the Motherboard e.g. VGA controller, Ethernet controller, System peripheral, Multimedia audio controller, PCI bridge, IDE interface, SATA controller, ISA controller, USB controller, etc.

Running Programs

Programs in Linux systems are stored  in several locations, including /bin, /usr/bin, and /usr /local/bin.

Root uses programs that can be found in /sbin, /usr/sbin, and /usr/local/sbin.

$free :display information about the usages of memories.

$fg : return to the program after put the program in background mode.

$bg: run the program in the background.

$gedit : run the GUI text editor

Common file manipulation commands

1. cat
2. chgrp: change group ownership of a file.
3. chmod: change permissions of a file.
4. chown: change ownership of a file.
5. cp
6. echo
7. head
8. less: display a text file a screen at a time. We can move forward or backward through the file. Try: g and G when in less, try /OPTIONS to search for OPTIONS, try n key to find next.
9. ln: create links to files
10. ls
11. mkdir
12. mv
13. rm
14. pwd
15. rmdir
16. tail
17. wc: count characters, words, and lines in a text file.
18. history
19. rm -r newdir: delete newdir and anyfiles or subdirectories it might have.
20. man 5 passwd: returns information from manual section 5
21. man passwd: returns information from manual section 1
22. There are 9 sections in total.
23. whatis man: search summary information contained in man pages for the keyword "man".
24. apropos: search the manual page names and descriptions
25. xman: GUI for man command
26. info :read Info documents
27. diff -q folder1 folder2:display the differences between the contents of two folders.
28. fc a.txt b.txt compare the contents of two files in Windows.
29. ls -1 (number 1): list only the file names of the folder
30. ls -1 folder1 > folder1content.txt
31. ls -1 folder2 > folder2content.txt
32. diff folder1content.txt folder2content.txt :to compare the contents of two folders in UNIX
33. dir folder_name /b > folderContent.txt : save a list of file names to a text file.

References

[1] Roderick W. Smith, Linux essentials, Sybex, 2012.

UNIX/Linux/Ubuntu system administration DAY 04

1. Install new software
2. Maintain user accounts
3. Manage the file system
4. Back up data 
5. Maintain the security of the system
6. Boot and shut down the system
7. Monitor and tune system performance