For Review Quiz!

This is my ultimate cheat sheet for the quiz tomorrow:

passwd - program located somewhere in shin that changes a password of a user. When in super user does not need a prior password

scripts: #!/bin/sh -

To start a script you need to use a shebang, which lets a computer know it is a script. The next words will specify the type of shell it is. Sh is one type Bash is the other. The both yield about the seam results. To execute a shell script, do ./(script name) Make sure to add sh at the end of a script.

shell script: #!/bin/bash

alias

drag and drop terminal, open - drag and drop is a useful teacher on the mac gui that allows you to drag a file to terminal and it will show the pathway to that file. Useful for saving time.

open -a safari, chess

permissions: chmod, ls -la, 421 rule 1-2-4 = rwx

4+2+1=7

Permissions allow someone to read,write, or execute. X has value of four. Write two. Read one. 777 gives full read/write permissions to all users. 700 makes private (rwx for you, nothing for anyone else.)

chmod a+x: changes permissions of a file to let you execute. You need to to make this to run your sciprt

chown- changes and items owner. Chown bob file1 will change owner of file1 to bob.

Chown bob:accounting file1 changes bob to owner and group to accounting. Use sudo before.

su vs. sudo: su is literally the root user. Using it will keep the session superuser. it is a hidden account to do anything. sudo is make superuser for command.

defaults commands - defaults (name of long script_ changes plist files to do all sorts of different. It can add, modify, or remove a preference from plist.

some examples:

defaults write com.apple.mail PreferPlainText -bool TRUE

defaults write com.apple.dashboard devmode YES; killall Dock

defaults write com.apple.dashboard mcx-disabled -boolean

YES; killall Dock

defaults write -g NSNavPanelExpandedStateForSaveMode -bool TRUE

sudo softwareupdate -i -a: perform a soft here update. -i -a are to flags that say to install everything that is found

grep, pipes: grep command sifts through log files looking for specific strings. grep error in /var/log/sstem.log will look through the log to find everything. How to use grep with something else: ps -ax | grep ssh

tar, tarballs: tar is a ape archive. tar -xf will decompress a thing.

textutil -convert filename1.ex -output filename2.ext will change a file

textutil -convert ext1 file1.ext2 will convert ext 2 to ext1

curl URL > filename.html: use it to save a local copy of a webpage

Here is for public ip -

curl -s http://www.showmyip.com/simple/; echo

here is for nearby wifi

/System/Library/PrivateFrameworks/Apple80211.framework/

Versions/A/Resources/airport -s

Lsof -i shows processes that are connecting to the intent

ping shows if a server is running

host shows the ip address of a web server you are connected to.

ex: host www.facebook.com

whois shows info on a person that owns a domain name.

whois tidbits.com

SCP- secure copy. how to use scp -r user@host:directory/SourceFolder TargetFolder