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Github Study Guide With Complete Solution
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Github Study Guide WithComplete Solution
Git vs Github - ANSWER Git is a Distributed Version Control System that
helps to track the changes in the source code. Git is simply a persistent hash
map wherein key is the hash of file and the value is the contents of the file.
Github is used to manage the remote repository. If you wanna use Git you
must install in your local machine.
cat command - ANSWER Allows us to create to create single or multiple files,
view contain of file, and concatenate files and redirect output in terminal or
files
nano - ANSWER edit the file using this shell command
what does git init do? - ANSWER creates the git repository and places the
hidden .git folder within the git repository
how to view hidden folders in finder - ANSWER command + shift + .
what are the four object types in git - ANSWER Blob, tree, commit, annotated
tag
what is blob - ANSWER It is an object type for git. Binary large object => Its
the object type used to store contents of each file in a repository (file data)
tree - ANSWER It's an object type for git. It stores information about
directories. In other words, it's just like a directory - it references bunch of
other trees and/or blobs, i.e. files and sub-directories
, commit - ANSWER Its an object type that allows to store different versions of
the project
annotated tag - ANSWER object type, which is a persistent pointer that
points to different commits
What does a hash function do? - ANSWER Generates a fixed length hash
based on the input. Same input will have the same hash. One way function.
Cannot get input based off hash. Only hash based off input
git hash-object - ANSWER allows us to create a new blob object type
sha1 bit size? - ANSWER 160 bits
how to create hash from string in command line ANSWER echo "Hello Git" |
shasum
what is the probability of reaching a specific hash given a file ANSWER
1/(2^160) => There are 2^160 possible options for SHA1 (160 bits)
git cat-file options ANSWER - git cat-file -p <hash> => contents of the
object
- git cat file -s <hash> => size of the object
- git cat file -t <hash> =>type of the object
how to git the hash of the a file or object using pipe - ANSWER echo "Hello,
Git" | git hash-object --stdin -w
--stdin => take input from standard input
- w => create git object
how would you write a string to a new file - ANSWER echo "Hello Git" >
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