The road to mathematics-the basic technology of Distributed Computing-linux/unix (4)

PWD Show current folder, ls View files under folder, CD into folder

-bash-4.2$ pwd

/home/myhaspl
-bash-4.2$ ls
ABC hadoop-2.4.1 mydoclist mypylst mypylsts numpy
Abd hadoop-2.4.1-src.tar.gz myl2 Mypylst1 myrun pypy-2.3.1-src
Error.log hadoop-2.4.1.tar.gz mylist mypylst2 myse SE
-bash-4.2$ CD NumPy
-bash-4.2$ ls
Bento_build.txt BUILD INSTALL.txt numpy runtests.py test_commit
Bento.info compatibility LICENSE.txt pavement.py setupegg.py THANKS.txt
Branding dev_readme.txt manifest.in README.txt setup.py Tools
Bscript Doc mydoclist release.sh site.cfg.example Tox.ini

-bash-4.2$

mkdir Creating a Folder

RM Delete File R-Reference indicates recursive deletion. Along with subfolders and their included deletions, F-parameters indicate forced deletion

-bash-4.2$ mkdir ABCD
-bash-4.2$ CD ABCD
-bash-4.2$ mkdir ABCD1
-bash-4.2$ CD ~
-bash-4.2$ ls
ABC hadoop-2.4.1 MYL2 MYPYLST2 numpy
ABCD hadoop-2.4.1-src.tar.gz mylist mypylsts pypy-2.3.1-src
Abd hadoop-2.4.1.tar.gz mypylst Myrun SE
Error.log mydoclist Mypylst1 Myse
-bash-4.2$ RM-RF ABCD
-bash-4.2$ ls
ABC hadoop-2.4.1 mydoclist mypylst mypylsts numpy
Abd hadoop-2.4.1-src.tar.gz myl2 Mypylst1 myrun pypy-2.3.1-src
Error.log hadoop-2.4.1.tar.gz mylist mypylst2 myse SE
-bash-4.2$

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Vim Editor

$vim

After startup. Display interface

Simple operation. Press I to enter insert mode, enter character

Then press the ESC key to exit Insert mode, enter: wq! Hello, with "Hello" as the file name, save to exit.

-bash-4.2$ Cat Hello

Hello

world!

-bash-4.2$

Vim often uses the operation keys

Vim

Shortcut keys:

Ctags

File name

Do index

Cursor Movement:

Four Directions

K

H

0

L

J

Ctrl+f,

Ctrl+b

Page DOWN, PAGE up

Ctrl+d,

Ctrl+u

Half page DOWN, half page up

$

Move end of line

0

Move beginning

W

Move the next word

B

Move to the previous word

Gg

Jump to the beginning of the document

G

Jump to the end of the document

%

Jumps to the matching brackets ("{

}""[]""()"）

Ctrl+i,tab

Skip to Next

Jump

Point

Ctrl+o

Skip to Previous

Jump

Point

23GG,

23G,

: 23

Jump to the first

23

Yes

Ctrl+i,

tab

Jumps to the next hop point (jump

Point)

Ctrl+o

Jump to last Hop point

Find Replacements:

#

Find the entire keyword backwards from the cursor

*

Find the entire keyword from the cursor forward

g#

Find keywords backwards from the cursor

g*

Find keywords from the cursor forward

Fx,tx,fx. Tx

Find characters in current line

Find a replacement sample:

:

S/search/replace

:

S/if/since

Replace the next "If" with "Since"

:

%s/if/since

Replace All "If" with "Since"

Word boundaries:

Specify word boundaries:

\<

And

\>

Such as:

/\<d[a-z]*an\>

Match to

D

Start with a random lowercase letter in the middle to

An

End of

Words

/\$[0-9]*\. [0-9] [0-9]

Match Lookup

$XX ... x.xx

That's the number, and there are only two small

Number of

Frequently used editing commands:

A

I

After the cursor is inserted,

Insert before the cursor

Dd

Delete a row

Cc,s

Delete a row and enter

Insert

Mode

Dw

Delete a word

cw

Delete a word and enter it

Insert

Mode

X,dl

Delete a character

S,cl

Delete a character after entering

Insert

Mode

P

Paste

Xp

Swap two characters

Ddp

Swap two lines

Y

Copy

Yy

Copy a row

U

Undo

Ctrl+r

Redo

.

Repeated last change

Ctrl+r

Redo

.

Repeated last change

Shell Basics,

Edit the shell file below and name the extension ". Sh"

-bash-4.2$ Cat test1.sh
#!/bin/sh
Ls-la
CD NumPy
Ls
-bash-4.2$ chmod A+rx test1.sh
-bash-4.2$./test1.sh

Mathematical pathways-distributed computing-linux/unix Technology Fundamentals (4)