CS6 Practical System Skills Fall 9 edition Leonhard Spiegelerg - - PowerPoint PPT Presentation

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CS6 Practical System Skills Fall 9 edition Leonhard Spiegelerg - - PowerPoint PPT Presentation

Oct 15, 2022 612 likes •1.3k views

CS6 Practical System Skills Fall 9 edition Leonhard Spiegelerg lspiegel@s.rown.edu . Reap 2 / 68 . Reap / / . .. ~ cd ls 3 / 68 . Reap uiz /usr/local/bin

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SLIDE 1

CS6

Practical System Skills

Fall 9 edition

Leonhard Spiegelerg lspiegel@s.rown.edu

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SLIDE 2

. Reap

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SLIDE 3

. Reap

/ ⇒ / ⇒ . .. ~ cd ls

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SLIDE 4

. Reap uiz

/usr/local/bin cd .. cd ./../.. cd cd ~

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SLIDE 5

. Reap uiz

/usr/local/bin cd .. /usr/local cd ./../.. /usr cd HOME directory cd ~ HOME directory

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SLIDE 6

. Reap uiz

ls Documents ls ls -a

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Documents mail .backups 2018 2019 .backupdb cwd

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SLIDE 7

. Reap uiz

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Documents mail .backups 2018 2019 .backupdb cwd ls Documents ls: Documents: No such file or directory ls mail ls -a . .. mail .backups

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SLIDE 8

Files

CS6 Pratial System Skills

Fall 9

Leonhard Spiegelerg lspiegel@s.rown.edu

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SLIDE 9

. Ceatin and deletin files

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touch file

mkdir directory_name

rm file

rmdir directory_name

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SLIDE 10

. Wokin ith dietoies

  • p

mkdir -p folder/subfolder/subsubfolder

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SLIDE 11

. Deletin files and dietoies

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SLIDE 12

. Deletin files

  • r

rm -r folder/

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SLIDE 13

. Deletin files in a tee

  • r
  • i

Example: rm -ri folder/

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SLIDE 14

. Deletin files in a tee

  • r
  • f

Example: rm -rf folder/

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SLIDE 15

Bak to the teminal...

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SLIDE 16

. Oanizin files

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mv src ... dest move file from src location to dest location ⇒ can be used to rename a file cp src ... dest copy file from src location to dest location

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SLIDE 17

. Copin dietoies

cp -R src dest / cp

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SLIDE 18

. Copin dietoies

Examples: cp -R folder copy

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cwd cwd

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SLIDE 19

. Copin dietoies

Examples: cp -R folder/ copy

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cwd cwd

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SLIDE 20

. Copin dietoies

Examples: cp -R folder/ .

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cwd cwd

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SLIDE 21

. Copin dietoies

Examples: cp -R folder/ dest

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cwd cwd

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SLIDE 22

. Copin dietoies

Examples: cp -R folder dest

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cwd cwd

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SLIDE 23

. Moin dietoies

mv folder dest mv folder/ dest

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cwd cwd

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SLIDE 24

. Renamin files/dietoies

⇒ dest mv ⇒

  • n
  • i

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cwd

mv folder/a.txt folder/file.txt

cwd

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SLIDE 25

. Renamin files/dietoies

⇒

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cwd mv folder dir cwd

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SLIDE 26

Ho to m o p a suset o files?

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SLIDE 27

. UNIX ildads

⇒

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SLIDE 28

. UNIX ildads

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* ? [...] [a-z] [0-9] [a-zA-Z] [a-zA-Z0-9] [!...] [!123] Hint: escape [, *, ? using a backslash, e.g. * ⇒ \*

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SLIDE 29

. UNIX ildads - eample

⇒

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/*folder/file?.txt /folder/file1.txt /subfolder/filea.txt /subsubfolder/fileB.txt folder/file.txt folder/file1.txt /subfolder/a.txt /folder/subfolder/file1.txt

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SLIDE 30

. UNIX ildads

mv *.jpg images/ mv *?.jpg images/

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SLIDE 31

. UNIX ildads

mv *.jpg images/ mv *?.jpg images/

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SLIDE 32

. UNIX ildads

cp [0-9][0-9]_*.pdf slides/

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SLIDE 33

. UNIX ildads

⇒ ⇒

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mv {*.png,*.jpg} images/

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SLIDE 34

. Bae epansion

{...} {*.png,*.jpg} ⇒ *.png *.jpg Example: mv {*.png,*.jpg} images/ ⇒ mv *.png *.jpg images/

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SLIDE 35

. Bae epansion

Shorter version: mv *.{png,jpg} images/ ⇒ mv *.png *.jpg images/

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SLIDE 36

. Bae epansion

Example: ls {lecture,slide*}_??.{pdf,dvi} ⇒ ls lecture_??.pdf lecture_??.dvi slide*_??.pdf slide*_??.dvi

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SLIDE 37

. Bae epansion

⇒ Examples: ls {a,b{c,d}}.txt ⇒ ls a.txt b{c,d}.txt ⇒ ls a.txt bc.txt bd.txt ls {a,{b,c}}.txt ⇒ ls a.txt b.txt c.txt

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SLIDE 38

. Bae epansion

cp file{,.backup} ⇒ cp file file.backup

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SLIDE 39

. UNIX ildads

cp *.*{,.backup} ⇒ cp *.* *.*.backup ⇒ ⇒

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SLIDE 40

Ho an e aess the ontents o a file?

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SLIDE 41

. File tpes

⇒ ⇒

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SLIDE 42

. Tet files

cat file …

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. Tet files - ASCII

⇒ ⇒

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SLIDE 44

. Tet files - ISO/IEC -

⇒ ⇒

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SLIDE 45

. Tet files - ASCII and UTF- enodin

⇒

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SLIDE 46

. Tet files - UTF- enodin

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number of bytes Byte 1 Byte 2 Byte 3 Byte 4 1 ASCII chars 0xxxxxxx 2 Latin, Greek, Cyrillic, Coptic, Armenian, Hebrew, Arabic, Syriac, Thaana, ... 110xxxxx 10xxxxxx 3 Chinese, Japanese, Korean, …. 1110xxxx 10xxxxxx 10xxxxxx 4 Math symbols, Emojis 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

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SLIDE 47

. Editin tet files

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⇒

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SLIDE 48

. Bina files

⇒ hexdump file ⇒

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SLIDE 49

. hedump

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hexdump penguin.jpg 0000000 ff d8 ff e1 12 d4 45 78 69 66 00 00 4d 4d 00 2a 0000010 00 00 00 08 00 0c 01 00 00 03 00 00 00 01 08 00 0000020 00 00 01 01 00 03 00 00 00 01 0c 00 00 00 01 02 0000030 00 03 00 00 00 03 00 00 00 9e 01 06 00 03 00 00 0000040 00 01 00 02 00 00 01 12 00 03 00 00 00 01 00 01 0000050 00 00 01 15 00 03 00 00 00 01 00 03 00 00 01 1a 0000060 00 05 00 00 00 01 00 00 00 a4 01 1b 00 05 00 00 0000070 00 01 00 00 00 ac 01 28 00 03 00 00 00 01 00 02 0000080 00 00 01 31 00 02 00 00 00 24 00 00 00 b4 01 32 0000090 00 02 00 00 00 14 00 00 00 d8 87 69 00 04 00 00 ...

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SLIDE 50

. hedump s. at

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cat file.txt Tux loves CS6 hexdump -c file.txt 0000000 T u x l o v e s C S 6 \n 000000e hexdump file.txt 0000000 54 75 78 20 6c 6f 76 65 73 20 43 53 36 0a 000000e ⇒

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SLIDE 51

. file

file file

⇒ ⇒

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Example: file penguin.jpg penguin.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=12, height=3072, bps=0, PhotometricIntepretation=RGB,

  • rientation=upper-left,

width=2048], progressive, precision 8, 512x513, frames 3

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SLIDE 52

. Uni oaula so a

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cd ls touch rm mkdir rmdir mv cp cat hexdump file

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SLIDE 53

Uses and Pemissions

CS6 Pratial System Skills

Fall 9

Leonhard Spiegelerg lspiegel@s.rown.edu

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. Pemissions

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. Pemissions

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SLIDE 56

. Pemissions o dietoies

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. Uses and pemissions

⇒ ⇒

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SLIDE 58

. Uses and pemissions

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⇒

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SLIDE 59

. ls lonomat

ls -l

total 88

  • rw-r--r-- 1 sealion friends 14 9 Sep 8:01 file.txt
  • rw-r--r-- 1 sealion friends 40390 9 Sep 9:00 penguin.jpg

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  • wner and user are usually the same!

Terms are used interchangeably here often.

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SLIDE 60

. Pemissions

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  • rw- r-- --x
  • d

l p s b c

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. Settin pemissions - hmod

chmod mode file … ⇒ ⇒

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. hmod - smoli mode

chmod u=rw,g=rx,o= file.txt

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SLIDE 63

. hmod - numei mode

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000

  • 1

001

  • -x

2 010

  • w-

3 011

  • wx

4 100 r-- 5 101 r-x 6 110 rw- 7 111 rwx

chmod u=rw,g=rx,o= file.txt ⇒ chmod 650 file.txt

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SLIDE 64

Moe details net letue!

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SLIDE 65

Peie net letue

⇒ ⇒ ⇒ ⇒

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SLIDE 66

Peie HW:

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SLIDE 67

Peie La:

⇒

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SLIDE 68

End of lecture.

Next class: Thu, pm-:20pm @ CIT 77