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Wednesday, 10. November 2010
Read Private feeds

You can use "live bookmarks", the built-in RSS reader of Firefox to read private feeds.
To view Gmail messages in this manner, just subscribe to a new feed, enter https://mail.google.com/mail/feed/atom in the URL field, and submit your Gmail address and password.

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Sunday, 4. July 2010
concise wikipedia extension

https://addons.mozilla.org/en-us/firefox/addon/wikisearch-concise/

The user will select any word from the current webpage and choose "wikipedia Concise" on the right click. The selection will be submitted to the website mobile.wikipedia.org
For e.g. if I have selected the word "obama" and searched using "wikipedia description", I will be directed to the site that will show me a few lines about Barack Obama.

The URL is menioned in the url tag and that looks something like this.
mobile.wikipedia.org/transcode.php?go=obama

pretty easy, huh?

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Sunday, 13. June 2010
Improve InnoDB performance

innodb_flush_method=O_DIRECT
innodb_file_per_table
innodb-flush-log-at-trx-commit = 2

# number of cpus * number of disks * 2
#innodb_thread_concurrency=16
_____
Lowering the value of swappiness may help mysql

# default 60
echo '50' > /proc/sys/vm/swappiness

Make the change permanent:
/etc/sysctrl.conf
vm.swappiness = 50

# innodb basic settings
innodb_buffer_pool_size=1G
innodb_log_file_size=512M

# MyISAM only cnf setting
user=root
skip-innodb
default-storage-engine=myisam
bulk_insert_buffer_size=1G
key-buffer=1G

# increase default 2 GB on 32 bit OS
myisam_max_sort_file_size=40G
myisam_sort_buffer_size=512M

# make sure temp directory has sufficient space
# and mysql has permission to write
tmpdir=/

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Saturday, 12. June 2010
Brace Expansion

Brace expansion is used to generate arbitrary strings. For e.g.
ls mysql*.0000{1..3}

will list the files like mysql.00001 mysql.00002 & mysql.00003

This can also be used for something like this...

cp mysql.log{,.bak}
>> cp mysql.log mysql.log.bak

cp $da.log{.bak,}
>> cp 2010-05-28.log.bak 2010-05-28.log

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Thursday, 10. June 2010
Microsoft Mess

Microsoft mess is not a topic for me to blog anymore. But since someone whose blog I track has mentioned about it, let me link the article.

http://ma.tt/2010/06/windows-reboot/

The only advice is do not use Micro$oft products when better alternatives are available. The machine automatically boots when the security updates are installed silently! Another reason to use pirated software?

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Monday, 12. April 2010
mysql login

Instead of specifying password in mysql command line, I prefer storing it in ~/.my.cnf while doing such works to avoid typing passwords every time. you can create this file or supply password as you wish.

$ cat ~/.my.cnf
[client]
user=root
password="password"

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Tuesday, 6. April 2010
Saving files in VI

You can save the current file as a new file after making changes,
:w new_file.txt

If you want only 50 lines starting from line number 100, use...
:100,150w! new_file.txt

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Wednesday, 24. March 2010
User input in shell script

#!/bin/sh
unset REPLY
until [[ $REPLY ]]; do read -p "Enter your name: "
done
echo "welcome $REPLY"

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Friday, 19. March 2010
Upgrade PEAR

I spent a lot of time figuring out how to upgrade my PEAR package.
The trick is to install the PEAR package with –force to make it go through

# pear upgrade --force PEAR

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Monday, 11. January 2010
Counting file types

cat myawk.sh
#!/bin/sh
# list the type of files with count
find ${*-.} -type f -print | xargs file |
awk '{
$1=NULL;
t[$0]++;
}
END {
for (i in t) printf("%d\t%s\n", t[i], i);
}' | sort -nr

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