CH9: Working with file

Question 1

all files are case sensitive (T/F)

Answer 1

True

winter.txt !== Winter.txt

Question 2

everything is a file (T/F)

Answer 2

True

A directory is a special kind of file, but it is still a (case sensitive!) file.

Question 3

Define DIrectory

Answer 3

A directory is a special kind of file, but it is still a (case sensitive!) file.

Question 4

file

Answer 4

The file utility determines the file type. Linux does not use extensions to determine the file type

~$ file pic33.png
pic33.png: PNG image data, 3840 x 1200, 8-bit/color RGBA, non-interlaced

Question 5

how linux recognize file types ?

Answer 5

The file command uses a magic file that contains patterns to recognise file types. The magic file is located in /usr/share/file/magic

Question 6

file -s

Answer 6

for special files
like:
/ prod
/ dev

Question 7

touch

Answer 7

create an empty file

Question 8

touch -t

Answer 8

set some properties while creating empty files

Question 9

rm

Answer 9

remove forever

Question 10

Linux have a trash bin to recover removed files (T/F)

Answer 10

the command line in general does not have a waste bin or trash can to recover files

Question 11

rm -i

Answer 11

o prevent yourself from accidentally removing a file

Question 12

rm -rf

Answer 12

O will not remove none empty directories

O The rm -rf statement is famous because it will erase anything

You can literally erase your entire file system by accident.

Question 13

cp

Answer 13

To copy a file, use cp with a source and a target argument.

Question 14

how to copy file

Answer 14

cp file42 file42.copy

Question 15

Copy file to another directory

Answer 15

paul@debian7:~$ mkdir dir42 paul@debian7:~$ cp SinkoDeMayo dir42

Question 16

cp -i

Answer 16

To prevent cp from overwriting existing files

aul@debian7:~$ cp -i SinkoDeMayo file42 cp: overwrite `file42’? n paul@debian7:~$

Question 17

mv

Answer 17

to rename a file or to move the file to another directory

Rename files
ls
file33

mv file33 file34

ls
file34

also can used to rename directories

Question 18

mv -i

Answer 18

to prevent for accidently rename file

Question 19

mv is more popular than rename

Answer 19

use mv whenever you need to rename only a couple of files.

the rename command on linux use regular expressions

Question 20

rename ‘s/.txt/.png/’ *.txt

what this code do

Answer 20

switches all occurrences of txt to png for all file names ending in .txt.

Question 21

$ rename ‘s/file/document/’ *.png

Answer 21

switches all (first) occurrences of file into document for all file names ending in .png.

Question 22

RHEL short for

Answer 22

Red Hat Enterprise Linux