Linux and C
LogN
More people working on a problem means more room for error
Milk example for hierarchy and creating “infinity”
Linux
Data: Files and paths
Two types ~
Directory: A file that contains other files
File: A normal file
The root: /
pwd: Print Working Directory - tells you where you are in the path (file explorer)
ls: List - lists out files / directories beneath where you are currently at
ls -l : Give me the files in a table / with more info - Gives when it was created, the size, who owns it
If it is preceded with a d, that means it is a directory
cd (directory name): brings you to the desired directory
cd .. : Brings you to your parent directory
. : single dot is the location where I am currently
cd ./(directory name) : Bring me to the desired directory underneath my current position
Can put in . or .. in directory name place
d rwx rwx rwx
me
group
world
Tells whether or not certain parties can read, write, or execute this file
110 011 001
6 3 1
chmod 644 (file name) - makes it to where I can read and write but everyone else can only read
cd /Users/pdjoshi/cs429/test - absolute path starting from the root (must always start from the root)
Other paths are relative paths (Relative to your starting point)
cd ./ test is the same as cd test because the ./ is implicit (there are certain circumstances where you must specify)
whoami - tells you what file you are at
who - tells you which users are logged into this machine
this is because there may be multiple machines that have access to a single data center
And then multiple can log onto any of these machines and access data from that data center (they will only be able to see data their account has access to)
la -a : shows you all files including hidden files
Hidden files are characterized by the . being the first character in their name
rm - removes a file
rm dir - removes directory
alias rm=’rm -i
alias is a shortcut created only for your use
Does not restart when your restart the terminal
unalias rm
rm junk
touch junk
man ls - gives you a manual on all the different things you can use with ls
history - will give you past commands you have written