Study Flashcards
What is ARPANET?
Established in 1969 to allow transfer of data between various institutes of research and to answer the call of the US department of defense for a technology that would provide messaging capabilities to the government in an event of nuclear war
Established in 1969 to allow transfer of data between various institutes of research and to answer the call of the US department of defense for a technology that would provide messaging capabilities to the government in an event of nuclear war
ARPANET
What is mosiac?
Released in january 1993 and introduces hyperlinks, image tags, clickable buttons, and was affordable
What is Netscape?
Original mosaic and released in 1994 and in html2. Paved way for world wide web
Original mosaic and released in 1994 and in html2. Paved way for world wide web
Netscape
What is Internet explorer?
Released with windows 95
What is TCP
Transmission Control Protocol and divides files into packets, orders them, and forwards to IP
What is IP?
Internet Protocol and contains sender’s address and receiver’s address.
Internet Protocol and contains sender’s address and receiver’s address.
IP
What is FTP
File Transfer Protocol and allows easy ways of file transfer to a server and ways to download from said a server
File Transfer Protocol and allows easy ways of file transfer to a server and ways to download from said a server
FTP
What is HTTP?
Hypertext transfer protocol and used to fetch html documents, images, and videos
Hypertext transfer protocol and used to fetch html documents, images, and videos
HTTP
What is a crawler?
Indexes web pages and makes them available for search via indexed words
Indexes web pages and makes them available for search via indexed words
Crawler
What is a directory?
Stores files on computer in hierarchical file system in Linux, MS-DOS, OS/2, and Unix
Stores files on computer in hierarchical file system in Linux, MS-DOS, OS/2, and Unix
Directory
What is a subject guide?
List databases, encyclopedias, e-books, and web sites in a particular field
List databases, encyclopedias, e-books, and web sites in a particular field
Subject guide
Semantic vs presentational
Semantic describes an object and by what it is, presentational describes the “look” of an object, which is un-semantic
What is embedded CSS?
CSS that is in the “” tag
CSS that is in the “” tag
Embedded CSS
What is external CSS?
CSS that is linked via “” tag inside “” tag, and is on separate file
CSS that is linked via “” tag inside “” tag, and is on separate file
External CSS
What is inline CSS?
CSS that is inside an element
CSS that is inside an element
Inline CSS
Absolute vs relative units CSS
Absolute units are fixed and the size is exact on any screen.
Relative units are sized relative to another length property.
CSS link styles
a: link is a normal unvisited link
a: visited is a link the user has visited
a: hover is a link the mouse is on
a: active is a link the moment it’s clicked
Hexadecimal color specifiers
RRGGBB where r is red, g is green, and b is blue
RRGGBB where r is red, g is green, and b is blue
Hexadecimal color specifiers
What is em and how does it work?
sized relative to parent size (usually 16px) and allows for text zooming too
sized relative to parent size (usually 16px) and allows for text zooming too
em
pwd command
Finds what directory you’re in
Finds what directory you’re in
pwd command
Level up command
..
..
Level up command
Get to desired location command
cd
cd
Get to desired location command
List command
ls -1 for list of files and permissions
ls -1 for list of files and permissions
List command
touch command
Creates new file
New file command
touch
Change permissions command
chmod 755 (file name)
chmod 755 (file name)
Change permissions command
Permission numbers
4 for read
2 for write
1 for execute
0 for none
4 for read
2 for write
1 for execute
0 for none
Permission numbers
mkdir (file name)
Makes new directory
Makes new directory
mkdir (file name)
User, group, and others symbols
rwx-xr-x
rwx-xr-x
User, group, and others symbols
Symbols for adding permissions
“a” is all, “u” is user, “g” is group, “o” is others
“a” is all, “u” is user, “g” is group, “o” is others
Symbols for adding permissions
Adding permissions to a user
chmod u+x (file name)
chmod u-x (file name)
chmod u=x (file name)
chmod u+x (file name)
chmod u-x (file name)
chmod u=x (file name)
Adding permissions to a use
rmdir (file name)
Removes a directory
Removes a directory
rmdir (file name)
mkdir -p a/b/c
Makes multiple directories with -p can also be removed this way
Makes multiple directories with -p can also be removed this way
mkdir -p a/b/c
List types
“-a” shows all files “-l” shows files and permissions “-d” shows directory info “-h” is human readable mode “-s” prints file sizes “-S” sorts by size “-t” sorts by time
“-a” shows all files “-l” shows files and permissions “-d” shows directory info “-h” is human readable mode “-s” prints file sizes “-S” sorts by size “-t” sorts by time
List types
man ls
Shows all types
Shows all types
man ls
mv
Renames file if it doesn’t exist, or moves if it does
Renames file if it doesn’t exist, or moves if it does
mv
cp
Copies file to specified file
Copies file to specified file
cp
cp -r
Copies directory to specified directory
Copies directory to specified directory
cp -r
rm
Removes files
Removes files
rm
rm -r
Removes directory and it’s contents and anything under that
Removes directory and it’s contents and anything under that
rm -r
cat
Concatenates two files
Concatenates two files
cat
First character of a file is
File type
File type is represented by
First character of file
File types
“-“ is regular file. “d” is directory, “l” is symbolic link
CRAP
Contrast, Repetition, Alignment, and Proximity
Contrast, Repetition, Alignment, and Proximity
CRAP
