sudo ssh -N -D 999 user_name@server_address

for i in `ipcs -s | grep apache | awk '{print $2}'` ; do ipcrm -s $i; done

git config --global url."https://".insteadOf git://

location /chat {
proxy_pass http://node_app; 
proxy_http_version 1.1; 
proxy_set_header Upgrade $http_upgrade; 
proxy_set_header Connection "upgrade";
}

[client]
user=root
password="pass"

[mysql]
user=root
password="pass"

[mysqldump]
user=root
password="pass"

[mysqldiff]
user=root
password="pass"

sudo apt-add-repository ppa:rael-gc/rvm
sudo apt-get update
sudo apt-get install rvm

AuthType Basic
AuthName "Restricted area"
AuthUserFile /home/data/site/.htpasswd
Require valid-user

#!/bin/sh
BASEDIR=$(dirname $0)

SELECT * FROM t1
  ORDER BY key_part1,key_part2,... ;

SELECT * FROM t1
  WHERE key_part1 = constant
  ORDER BY key_part2;

SELECT * FROM t1
  ORDER BY key_part1 DESC, key_part2 DESC;

SELECT * FROM t1
  WHERE key_part1 = 1
  ORDER BY key_part1 DESC, key_part2 DESC;

SELECT * FROM t1
  WHERE key_part1 > constant
  ORDER BY key_part1 ASC;

SELECT * FROM t1
  WHERE key_part1 < constant
  ORDER BY key_part1 DESC;

SELECT * FROM t1
  WHERE key_part1 = constant1 AND key_part2 > constant2
  ORDER BY key_part2;

ssh-keygen -R "hostname"

du -hs *

nano /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address XXX.XXX.XXX.XXX
        netmask 255.255.255.255
        gateway XXX.XXX.XXX.XXX

/etc/init.d/networking restart

crontab /path/to/file

crontab -l

crontab -r

crontab -e

crontab -u username

@reboot	Запуск при загрузке	
@yearly	Раз в год	0 0 1 1 *
@annually	Тоже что и @yearly	
@monthly	Раз в месяц	0 0 1 * *
@weekly	Раз в неделю	0 0 * * 0
@daily	Раз в день	0 0 * * *
@midnight	В полночь (00:00)	
@hourly	Каждый час	0 * * * *

sudo apt-get install nginx-extras
sudo update-rc.d nginx enable

yum -y groupinstall "Development Tools"

git clone git://git.videolan.org/x264.git
cd x264
./configure --prefix=/usr --bindir=/usr/bin --libdir=/usr/lib64 --disable-asm --enable-shared
make && make install
cd ..

git clone https://github.com/mstorsjo/fdk-aac.git
cd fdk-aac
autoreconf -i
./configure --prefix=/usr --bindir=/usr/bin --libdir=/usr/lib64 --disable-shared
make && make install
cd ..

wget http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz
tar xvzf yasm-1.2.0.tar.gz
cd yasm-1.2.0/
./configure
make && make install
cd ..

wget http://downloads.sourceforge.net/opencore-amr/vo-aacenc-0.1.2.tar.gz
tar xzvf vo-aacenc-0.1.2.tar.gz
cd vo-aacenc-0.1.2
./configure --prefix=/usr --bindir=/usr/bin --libdir=/usr/lib64 --disable-shared
make && make install
cd ..

wget http://downloads.sourceforge.net/opencore-amr/fdk-aac/fdk-aac-0.1.4.tar.gz
tar xzvf fdk-aac-0.1.4.tar.gz
cd fdk-aac-0.1.4
./configure --prefix=/usr --bindir=/usr/bin --libdir=/usr/lib64 --disable-shared
make && make install
cd ..

git clone git://source.ffmpeg.org/ffmpeg.git
cd ffmpeg
./configure --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --enable-libfdk-aac --enable-libx264 --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libvo-aacenc
make && make install
cd ..

yum list installed

git rm --cached mylogfile.log
git rm --cached -r mydirectory

~google_appengine/dev_appserver.py --skip_sdk_update_check --port 8085 --admin_port 9005 --php_executable_path /usr/local/bin/php-cgi ~application_path

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.syslogd.plist
sudo launchctl load /System/Library/LaunchDaemons/com.apple.syslogd.plist

<img id="uploadPreview" style="width: 100px; height: 100px;" />
<input id="uploadImage" type="file" name="myPhoto" onchange="PreviewImage();" />
<script>
function PreviewImage() {
    var oFReader = new FileReader();
    oFReader.readAsDataURL(document.getElementById("uploadImage").files[0]);
    oFReader.onload = function (oFREvent) {
        document.getElementById("uploadPreview").src = oFREvent.target.result;
    };
};
</script>