Chapter 1 Exploring Linux Commands

Question 1

Pg 14 Ryan

What is the Command Line for the manual?

Answer 1

man man

Question 2

pg 14

whats the command to view the entire environment?

Answer 2

env

Question 3

pg 18

This Symbol creates a new file containing standard output. If the specified file exist, its over written.No File Descriptor necessary

Answer 3

>

Question 4

file descriptors

Answer 4

An identification method to describe a program’s input, output, and error
stream as a file.

Question 5

This Symbol Appends Standard output to the existing file. If the specified file doesn’t exist, it’s created. No File Descriptor necessary

Answer 5

> >

Question 6

pg 36

Which Command represents the start of a line?

Question 7

pg 36

Which Command represents the end of a line?

Answer 7

$

Question 8

pg 19 and 20

What can be used to link together multiple programs so that the output of one program becomes the input of another?

Answer 8

the pipe character is the vertical bar ( | )

Question 9

What do parentheses do in Linux?

Answer 9

They are often used to specify how operators are to be applied.

Question 10

pg 36

What is grep?

Answer 10

it searches for files that contain a specified string and returns the name of the file and (if its a text file) a line of context for that string.

Question 11

in the event , if you cant find the command you want or if you change your mind and want to terminate the search what command do you press?

Answer 11

Ctrl+G

Question 12

PG 11
to retrieve the last command in your shell history what do you type? It will not only show you the command you recalled but execute it as well.

Answer 12

!! enter

Question 13

How can you use the numeric sort?

Answer 13

you can sort by using the -n or –numeric-sort option.

Question 14

what is the command option to break the input file into pieces of size bytes?

Answer 14

-b size or –bytes

Question 15

pg 6

What command will show you the path of the directory in which you are currently working?

Answer 15

the pwd command

Question 16

What does the uniq command do?

Answer 16

by default it outputs a file without any duplicate lines from the input file.

Question 17

pg 28

what does the fmt command do?

Answer 17

it reformats paragraphs within a file

Question 18

what is the function of the tail command? pg 32

Answer 18

It displays the last few lines of a file

Question 19

How many lines is the tail command by default? pg 32

Answer 19

10 lines

Question 20

whats the difference between grep and egrep?

Answer 20

the grep program uses basic regular expressions by default , but egrep uses extended regular expressions by default.