All

Question 1

ls -l

Answer 1

List all in file with information about the file including file type and permission, memory blocks used, owner of file, group of the owner, file size in bytes, date and time it was last created or modified, and the file/directory name.

Question 2

Metacharacter?

Answer 2

characters that have a special meaning in unix (* or ?)

Question 3

? metacharacter meaning?

Answer 3

This is like * (which matches with 0 or more characters) whereas ? matches with a single character.

Question 4

-a flag to ls

Answer 4

Lists invisible files

Question 5

Invisible files

Answer 5

An invisible file is one, the first character of which is the dot or the period character (.). Unix
programs (including the shell) use most of these files to store configuration information.
Some common examples of the hidden files include the files −
 .profile − The Bourne shell ( sh) initialization script
 .kshrc − The Korn shell ( ksh) initialization script
 .cshrc − The C shell ( csh) initialization script
 .rhosts − The remote shell configuration file

Question 6

. meaning

Answer 6

cd

Question 7

..

Answer 7

parent directory

Question 8

How to save from emacs?

Answer 8

C-x C-c

Control-x control-c

Question 9

cat meaning

Answer 9

show contents of file

Question 10

Copy command syntax

Answer 10

cp source_file destination_file

This will copy all bits of source and make a new file/overwrite destination

Question 11

Renaming file syntax

Answer 11

mv old_file new_file

Renames it!

Question 12

3 Unix streams?

Answer 12

stdin, stdout, stderr

Question 13

Home directory

Answer 13

The directory in which you find yourself when you first login is called your home directory.

Question 14

cd ~

Answer 14

brings you to your home directory

Question 15

cd -

Answer 15

brings you to your last directory

Question 16

How to open a directory within the current directory?

Answer 16

cd chem/notes
NOT
cd /chem/notes

This will open chem, then open notes.

Question 17

pwd

Answer 17

print working directory

Will print for example
“/user0/home/amrood”

Question 18

How to list the files inside of a directory?

Answer 18

ls directoryName

Question 19

How to open a directory regardless of cd?

Answer 19

cd /user/chem/notes

This STARTS WITH A BACKSLASH and will begin with the home directory and move from there.

Question 20

Make a directory

Answer 20

mkdir dirname

makes in cd

Question 21

Make a directory in home directory’s “files” directory… while your in a different directory called dogs

Answer 21

mkdir ~/files/dogs

Question 22

Requirement for removing directory?

Answer 22

-it needs to be empty, no files or sub-directories

Question 23

Full path vs relative path

Answer 23

full path begins with /, relative path begins with a directory inside the currentDirectory

Question 24

Is cd ../../home/amrood a valid relative path?

Answer 24

Yes!!

Question 25

How to rename a directory?

Answer 25

mv olddir newdir

Question 26

Permissions questions:

In the ls -l, what does the first character tell us?

Answer 26

the type of file!

Question 27

Permissions questions:

In the ls -l, what does the 2-4 characters tell us?

Answer 27

permissions for the file’s owner

Question 28

Permissions questions:

In the ls -l, what does the 5-7 characters tell us?

Answer 28

permissions for the group too which the file belongs

Question 29

Permissions questions:

In the ls -l, what does the 8-10 characters tell us?

Answer 29

permissions for everyone else

Question 30

Permissions questions:

First character is -. This means?

Answer 30

Regular file, such as an ASCII text file, binary executable, or hard link

Question 31

Permissions questions:

First character is b. This means?

Answer 31

Block special file. Block input/output device file such as a physical hard
drive

Question 32

Permissions questions:

First character is c. This means?

Answer 32

Character special file. Raw input/output device file such as a physical
hard drive

Question 33

Permissions questions:

First character is d. This means?

Answer 33

Directory file that contains a listing of other files and directories

Question 34

Permissions questions:

First character is l. This means?

Answer 34

Symbolic link file. Links on any regular file

Question 35

r-x is the group’s permissions. This means?

Answer 35

The group can read and execute but not write to this file!

Question 36

testfile permissions using ls -l is
-rwxrwxr–

How to let the world write and execute?

Answer 36

chmod o+wx testfile

Which would result in
-rwxrwxrwx. Everybody can now do everything!

Question 37

testfile permissions using ls-l is
-rwxrwxrwx

Make the group only able to read and execute!

Answer 37

chmod g=rx testfile
or
chmod g-w testfile

Question 38

How to combine chmod commands?

Answer 38

chmod o+wx,u-x testfile

Question 39

Access classes?

Answer 39

u user
g group
o other
a all (u,g,o)

You can modify these with chmod, o+w, u-x

Question 40

Pipe?

Answer 40

|

Output of one program is put into the input of another

Question 41

How to exit a process

Answer 41

control c