Alexey Bokov's weblog » linux

MySQL create user and add table

Alexey Bokov — Mon, 11 Jul 2011 12:05:07 +0000

Short how-to:
root@215003:~# mysql -u root -p Enter password: mysql> CREATE DATABASE s_db; mysql> GRANT ALL PRIVILEGES ON s_db.* to 's_user'@'localhost' IDENTIFIED BY '12345678'; mysql> FLUSH PRIVILEGES; mysql>exit mysql -u s_user -p s_db < database.sql <code>

bash tips – MySQL from script

Alexey Bokov — Mon, 31 Jan 2011 12:32:51 +0000

Here it is ( with user name, password, database host and db name ) : mysql -uuser_name -ppassword -hmysql_host_server_.domain.com -Ddatabase_name < database_commands.sql

Where’s Sun JDK on Ubuntu 10.04 ?

Alexey Bokov — Thu, 19 Aug 2010 13:46:08 +0000

By unknown reasons Sun JDK was moved to partner repository, so to use sun jdk you need to do this steps
sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" sudo apt-get update sudo apt-get upgrade
and then enjoy :
sudo apt-cache search jdk | grep sun sun-java6-source - Sun Java(TM) Development Kit (JDK) 6 source files sun-java6-jre - Sun Java(TM) Runtime Environment (JRE) 6 (architecture independent files) sun-java6-jdk - Sun Java(TM) Development Kit (JDK) 6 sun-java6-javadb - Java(TM) DB, Sun Microsystems' distribution of Apache Derby sun-java6-demo - Sun Java(TM) Development Kit (JDK) 6 demos and examples sun-java6-bin - Sun Java(TM) Runtime Environment (JRE) 6 (architecture dependent files)

telnet in bash scripts

Alexey Bokov — Thu, 29 Jul 2010 13:34:01 +0000

Using telnet in bash scripts to automate some stuff ? It’s really easy, here’s an example to tell “hello world” on telnet server :

req="hello world" server="my_server 1234" val=`( echo open ${server} sleep 3 echo "${req}" sleep 1 ) | telnet` echo $val

How to create list of screenshots for list of urls ?

Alexey Bokov — Tue, 20 Jul 2010 13:34:24 +0000

Okay, we have text file with list of urls and want to have firefox’s screenshots from this pages and also we need to have this screenshots in some normalized resolution ( like all images should be in 300×400 – thumbnails ). First of all you need to install Command line print Firefox add-on. Then create some simple script which will run firefox with needed url, print screenshot and close ( in my case via kill – may be it’s too brutal ) firefox in cycle. It may look like this ( url_list.txt – file with urls – each url on its own line ), after running this script you will have many *.png files which is screenshots for ulrs – 0.png – for first url in urls_list.txt, 1.png for second and so on.
#!/bin/bash id=0 while read line do firefox -print $line -printmode png -printdelay 10 -printfile ${id}.png ps ax | grep firefox | awk '{ print $1 }' | xargs kill -9 ; id=$[$id+1] done < urls_list.txt

And now then we have screenshots ( all this guys are in different resolution in common ) then we need to normalize them – to create thumbnails for all images in 300×400 resolution – convert helps!
for f in *.png; do convert -thumbnail 300x400! ${f} thumb_${f} done
And we have many thumb_*.pn with 300×400 resolution all. A little note – using resolution without ! sign will work in another way – resize will be processed proportionally with using resize only for one dimension ( bigger one ).

Ubuntu usefull tips

Alexey Bokov — Mon, 08 Feb 2010 16:03:38 +0000

Ubuntu doesn’t asking for login after boot up ( may happen after unexpected shutdown ) :
press Ctrl-Alt-F1 to login in terminal mode and use fsck to fix it

Add user short memo :[root@my-box ~]# useradd -g users -u 560 tuser [root@my-box ~]# passwd tuser
ps. sudo will be required in not-root case

Proper access rights for .ssh files :chmod 700 ~/.ssh chmod 600 ~/.ssh/id_rsa chmod 644 ~/.ssh/id_rsa.pub chmod 644 ~/.ssh/authorized_keys chmod 644 ~/.ssh/known_hosts

List all files in folder sorted by size : find . -type f -exec du -k "{}" \; | sort -n

Amazon Web Services links – October/November 2009

Alexey Bokov — Wed, 28 Oct 2009 11:11:26 +0000

Update in Amazon Web Services:

2 high cpu instance types : 64 bits – Double Extra Large с 34.2 GB RAM, and 13 ECU (4 virtual cores *3.25 EC2 compute Unit=ECU), 64-bit platform
and Quadruple Extra Large – 68.4 GB of RAM/ 26 ECU (8 virtual cores* 3.25 ECU) : New EC2 High-Memory Instances

Instance prices changes ( us-east is still cheaper thatn eu-west ) : Amazon EC2 – Now an Even Better Value

New service for relational DB ( provisioning, scaling and other nice things ) : Introducing Amazon RDS – The Amazon Relational Database Service

Security stuff : Vulnerability identified in Amazon’s cloud computing

Amazon EC2 – Ubuntu at google groups

5 years ago Amazon announced Amazon Simple Queue Service – top points of AWS for last 5 years

Bash’s find usefull stuff

Alexey Bokov — Tue, 20 Oct 2009 09:06:45 +0000

Recursively add files and foldes into CVS

find . -type d -print | grep -v CVS | xargs -n1 cvs add

Delete “.svn” files from current folder

find . -type f  -exec echo \"{}\" \;  | grep ".svn" | xargs rm

Sony Vaio – problems with WiFi under Ubuntu

Alexey Bokov — Fri, 14 Aug 2009 06:44:48 +0000

Some Sony Vaio owners ( my own is VGN-FZ31ER ) may have MAC is in deep sleep! problems – WiFI doesn’t work under Ubuntu because WLAN driver goes into forever sleep ( some bug in power safe logic I suppose ). This bug can be fixed by adding “noacpi” parametrs to Ubuntu boot command line.

Microsoft contribute code to Linux under the GNU GPL v.2

Alexey Bokov — Wed, 22 Jul 2009 07:04:47 +0000

Microsoft is offering about 20,000 lines of its own device drivers to the Linux kernel that will enable Linux to run as a guest on its Hyper-V virtualization technology. Specifically, the contributed loadable kernel modules enable Linux to run in ‘enlightened mode’, giving it efficiencies equivalent to a Windows virtual machine running on Hyper-V. Also see Redmond Releases Code to Linux Kernel Community at pcworld.com