Posts tagged ssh

MySQL: Repair & Optimize all Tables in all Databases

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MySQL tables can crash quite easily, especially when your server unexpectedly shuts down or crashed, or when you're forced to copy data around when it's still being accessed.

Luckily, there's a simple command to automatically check, repair and optimize all tables in all databases when you're running a MySQL server on Linux / Unix / BSD.

mysqlcheck -u root -p --auto-repair --check --optimize --all-databases

That's all there is to it!

Best Webhost

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Are you looking to create a website and have your own webhost? It is very simple but the first step is to find a dependable webhost company. We tried over 10 webhost companies (Servage, GoDaddy, Hostmonster, Blue host and may more) in the past 8 years and found the most affordable and dependable was DreamHost

There is nothing to loose you always have your 97 days money back grantee but further if you use our promo coupon you can take 90 USD OFF just use promotional discount coupon code: 

 

GIVE90GIFT

 

 

That gives you a One Year webhost for only 29.40 bucks.

Below is a table comparing popular webhosts and any hidden limtations they have. If you have updates to this please comment.

Feature Dreamhost Hostmonster GoDaddy (Delux)
Price/Month $8.95 $6.95 $6.99
Price Promo 1yr $107.4-90=$17.4 /first year Adhoc 5.95$x12=$71.4 $6.64×12=$79.68
Host Unlmited Domains Yes Yes Yes
Hosting Space Unlimited “Unlimited” but if high your account will be suspended 150GB
Bandwidth Unlimited Unlimited 1500GB
SSH Access By Default Need to send ID Can be requested no ID needed
CPU Limit No Limitation 60Sec then Site suspended No Limitation
Uptime 99.9 99.9 99.9
MYSQL Databases Unlimited 100 25
Email Accounts Unlimited Unlimited Unlimited
First Yr Domain Registration Free Yes Yes No
Custom Cronjob Yes Yes Yes
Tech Support Chat, Email Ticket system(response time: 1-24hours),Phone: only call back Phone, Chat, Ticket(Response time 1-24 Hours) Phone,Ticket(slow 1 Day response time)
Install Custom PHP Yes Simple see article here No No
FFMPEG Yes No No
Max File Upload Size 7MB, unlimited with Custom PHP install 2MB, can be increased with copying php to all folders, still limited with CPU time limit 7MB
Can host Adult Content Yes No Yes
Loading speed for a 64kb website size 2-3 Seconds performance is stable since dreamhost upgraded to new servers 2-3 Seconds, performance was stable 5-6 Seconds
Midnight Commander Installed by default Not installed and can not install it Not sure

Webin Configuration

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For security it is better to change the port in webmin from 10000 to another number to do this change that in webmin.

Login to webmin

Under Webmin>Webmin Configuration>Ports and Addresses

Under Listen on port: choose a 5 digit number.

 

Then in ssh root

you need to allow the new port

 

with the command:

system-config-securitylevel-tui

 

Use tab to get to Customize then add your port.

Basic vi Commands

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Basic vi Commands



What is vi?

The default editor that comes with the UNIX operating system is called vi (visual editor). [Alternate editors for UNIX environments include pico and emacs, a product of GNU.] 
The UNIX vi editor is a full screen editor and has two modes of operation:

  1. Command mode commands which cause action to be taken on the file, and
  2. Insert mode in which entered text is inserted into the file.

In the command mode, every character typed is a command that does something to the text file being edited; a character typed in the command mode may even cause the vi editor to enter the insert mode. In the insert mode, every character typed is added to the text in the file; pressing the <Esc> (Escape) key turns off the Insert mode.

While there are a number of vi commands, just a handful of these is usually sufficient for beginning vi users. To assist such users, this Web page contains a sampling of basic vi commands. The most basic and useful commands are marked with an asterisk (* or star) in the tables below. With practice, these commands should become automatic. 
NOTE: Both UNIX and vi are case-sensitive. Be sure not to use a capital letter in place of a lowercase letter; the results will not be what you expect.

 


 

To Get Into and Out Of vi

 

To Start vi

 

To use vi on a file, type in vi filename. If the file named filename exists, then the first page (or screen) of the file will be displayed; if the file does not exist, then an empty file and screen are created into which you may enter text.

 

 

* vi filename edit filename starting at line 1
vi -r filename recover filename that was being edited when system crashed

 

To Exit vi

 

Usually the new or modified file is saved when you leave vi. However, it is also possible to quit vi without saving the file. 
Note: The cursor moves to bottom of screen whenever a colon (:) is typed. This type of command is completed by hitting the <Return> (or <Enter>) key.

 

 

* : x<Return> quit vi, writing out modified file to file named in original invocation
:wq<Return> quit vi, writing out modified file to file named in original invocation
:q<Return> quit (or exit) vi
* :q!<Return> quit vi even though latest changes have not been saved for this vi call

 


 

Moving the Cursor

 

Unlike many of the PC and MacIntosh editors, the mouse does not move the cursor within the vi editor screen (or window). You must use the the key commands listed below. On some UNIX platforms, the arrow keys may be used as well; however, since vi was designed with the Qwerty keyboard (containing no arrow keys) in mind, the arrow keys sometimes produce strange effects in vi and should be avoided. 
If you go back and forth between a PC environment and a UNIX environment, you may find that this dissimilarity in methods for cursor movement is the most frustrating difference between the two. 
In the table below, the symbol ^ before a letter means that the <Ctrl> key should be held down while the letter key is pressed.

 

 

* j or <Return>
[or down-arrow]
move cursor down one line
* k [or up-arrow] move cursor up one line
* h or <Backspace>
[or left-arrow]
move cursor left one character
* l or <Space>
[or right-arrow]
move cursor right one character
* 0 (zero) move cursor to start of current line (the one with the cursor)
* $ move cursor to end of current line
w move cursor to beginning of next word
b move cursor back to beginning of preceding word
:0<Return> or 1G move cursor to first line in file
:n<Return> or nG move cursor to line n
:$<Return> or G move cursor to last line in file

 


 

Screen Manipulation

 

The following commands allow the vi editor screen (or window) to move up or down several lines and to be refreshed.

 

 

^f move forward one screen
^b move backward one screen
^d move down (forward) one half screen
^u move up (back) one half screen
^l redraws the screen
^r redraws the screen, removing deleted lines

 


 

Adding, Changing, and Deleting Text

 

Unlike PC editors, you cannot replace or delete text by highlighting it with the mouse. Instead use the commands in the following tables. 
Perhaps the most important command is the one that allows you to back up and undo your last action. Unfortunately, this command acts like a toggle, undoing and redoing your most recent action. You cannot go back more than one step.

 

 

* u UNDO WHATEVER YOU JUST DID; a simple toggle

 

The main purpose of an editor is to create, add, or modify text for a file. 

Inserting or Adding Text

 

The following commands allow you to insert and add text. Each of these commands puts the vi editor into insert mode; thus, the <Esc> key must be pressed to terminate the entry of text and to put the vi editor back into command mode. 

 

* i insert text before cursor, until <Esc> hit
I insert text at beginning of current line, until <Esc> hit
* a append text after cursor, until <Esc> hit
A append text to end of current line, until <Esc> hit
* o open and put text in a new line below current line, until <Esc> hit
* O open and put text in a new line above current line, until <Esc> hit

 

Changing Text

 

The following commands allow you to modify text. 

 

* r replace single character under cursor (no <Esc> needed)
R replace characters, starting with current cursor position, until <Esc> hit
cw change the current word with new text,
starting with the character under cursor, until <Esc> hit
cNw change N words beginning with character under cursor, until <Esc> hit;
e.g., c5w changes 5 words
C change (replace) the characters in the current line, until <Esc> hit
cc change (replace) the entire current line, stopping when <Esc> is hit
Ncc or cNc change (replace) the next N lines, starting with the current line,
stopping when <Esc> is hit

 

Deleting Text

 

The following commands allow you to delete text. 

 

* x delete single character under cursor
Nx delete N characters, starting with character under cursor
dw delete the single word beginning with character under cursor
dNw delete N words beginning with character under cursor;
e.g., d5w deletes 5 words
D delete the remainder of the line, starting with current cursor position
* dd delete entire current line
Ndd or dNd delete N lines, beginning with the current line;
e.g., 5dd deletes 5 lines

 

Cutting and Pasting Text

 

The following commands allow you to copy and paste text. 

 

yy copy (yank, cut) the current line into the buffer
Nyy or yNy copy (yank, cut) the next N lines, including the current line, into the buffer
p put (paste) the line(s) in the buffer into the text after the current line

 


 

Other Commands

 

Searching Text

 

A common occurrence in text editing is to replace one word or phase by another. To locate instances of particular sets of characters (or strings), use the following commands. 

 

/string search forward for occurrence of string in text
?string search backward for occurrence of string in text
n move to next occurrence of search string
N move to next occurrence of search string in opposite direction

 

Determining Line Numbers

 

Being able to determine the line number of the current line or the total number of lines in the file being edited is sometimes useful. 

 

:.= returns line number of current line at bottom of screen
:= returns the total number of lines at bottom of screen
^g provides the current line number, along with the total number of lines,
in the file at the bottom of the screen

 


 

Saving and Reading Files

These commands permit you to input and output files other than the named file with which you are currently working.

 

 

:r filename<Return> read file named filename and insert after current line
(the line with cursor)
:w<Return> write current contents to file named in original vi call
:w newfile<Return> write current contents to a new file named newfile
:12,35w smallfile<Return> write the contents of the lines numbered 12 through 35 to a new file named smallfile
:w! prevfile<Return> write current contents over a pre-existing file named prevfile

 



Source cs.colostate.edu


SSH Vi editor commands

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To exit…

vi – press escape to get into command mode if you re not already in command mode (if you are, it s OK to press it anyway). :q to quit :w to save, :wq to do both.

emacs – ^X^S to save, ^X^C to quit

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