Chap 1

Question 1

Find out where your home directory is

Answer 1

echo $HOME

Question 2

go to the root directory then back to home

Answer 2

cd /

Question 3

What directory are you currently in

Answer 3

pwd

Question 4

give an example of a relative and absolute path

Answer 4

/Users/carol/Music

../Music

Question 5

Whats an easy way to write a very long folder path

Answer 5

drag the file from finder to the terminal

Question 6

List all the files in a directory including hidden files.

Answer 6

ls -a

Question 7

list in a single column

Answer 7

ls -1

Question 8

list to show files and folders differentiated

Answer 8

ls -F

Question 9

List with file sizes
Notice that the first line of output with the option is
always a sum of the size of all files in the specified
directory.

Answer 9

ls -s
The -s option indicates the size of each file, in units
of 512 bytes. Why 512 bytes? Well, that’s what the
original Unix filesystem used as its block size all those
years ago, and since then that’s just what the ls -s
command uses. If you really want to use -s but aren’t
interested in 512-byte blocks, you can set the
environment variable BLOCKSIZE to 1024 to make the
resultant listings use the more logical 1 kilobyte size:

Question 10

See if a folder exists

Answer 10

ls -d Library

Question 11

what does the . prove using the above command

Answer 11

it confirms that the current directory is indeed the

period (.) shorthand, as explained earlier.

Question 12

List all files with more info

Answer 12

ls -l

Question 13

List all files with more info and hidden files

Answer 13

ls -la

Question 14

Get the file size of a file…..whet happens if you use the command on
a directory

Answer 14

du the_file_name

Question 15

Now for the total directory size

Answer 15

du -s the_file_name

Question 16

If you’d like separate totals for all directories and files, including
hidden ones, use a wildcard pattern that ignores the current (.) and parent
(..) directories, as discussed earlier in this chapter:

Answer 16

$ du -s * .[^.]*

Question 17

get the size of all .app files and sort by size

Answer 17

du -s /Applications/*.app | sort -rn

du -sh /Library/* //more human-readable output:

Question 18

Calculate available disk space

Answer 18

df -h; // divide-by-2 rule of the -h flag
df -H; // divide-by-10 rule
df -m: // -m flag to have df show you 1 MB blocks, which rounds

Question 19

list all the avaialble additional disks

Answer 19

ls /volumes

Question 20

show the long version of the above

Answer 20

ls -l /volumes