linux command line cheatsheet

linux_command_line_cheatsheet.txt

# kill multiple processes using keyword
kill -9 `ps -ef | grep keyword | grep -v grep | awk '{print $2}'`

# upgrade everything on debian
sudo apt-get update && sudo apt-get -y upgrade && sudo apt-get -y dist-upgrade && sudo apt-get -y autoremove
apt-get update &&  apt-get -y upgrade &&  apt-get -y dist-upgrade &&  apt-get -y autoremove

# viewing a user's ulimit's on debian (check /etc/security/limits.conf and /etc/pam.d/su)
su mysql -s /bin/sh -c "ulimit -a"
    
    /etc/security/limits.conf
    * soft nofile 1024000
    * hard nofile 1024000
    * soft nproc 10240
    * hard nproc 10240


# check sockets
netstat --unix -l

# check open ports
netstat -tulpn

# check how many processors you have
grep processor /proc/cpuinfo | wc -l

# check running services / daemons
service --status-all
initctl list # Upstart

# check nginx compiled modules
nginx -V

# disable apache2 startup at boot
update-rc.d apache2 disable

# against wget 403 forbidden error
wget -U "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.6) Gecko/20070802 SeaMonkey/1.1.4" "someLarge.tar"
wget -O wordpress.tar.gz http://wordpress.org/latest.tar.gz

#faster downloading with threads!
axel -a -n 6 http://www.example.com/Backup.tar -U "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.6) Gecko/20070802 SeaMonkey/1.1.4"

## UBUNTU ##

# check your version
lsb_release -a

# If add-apt-repository is missing:
sudo apt-get install python-software-properties

sudo add-apt-repository ppa:ondrej/mysql
sudo add-apt-repository ppa:ondrej/php5-experimental (apache 2.4.4 and php5)

# disk usage of directories
du -ch folderName
...

sudo add-apt-repository ppa:ondrej/php5-oldstable # (php5.4)
sudo add-apt-repository ppa:ondrej/php5 # (latest - not recommended as it requires higher apache version)

# removing ppa's
cd /etc/apt/sources.list.d/

# see installed modules / or any
dpkg --get-selections | grep php
dpkg -l | grep apache2

#memcached memory consumption
echo "stats" | nc -w 1 127.0.0.1 11211 | awk '$2 == "bytes" { print $2" "$3 }'

# folder sizes
du -hsx * | sort -rh | head -10

#check which locales are supported :
# http://askubuntu.com/questions/76013/how-do-i-add-locale-to-ubuntu-server
less /usr/share/i18n/SUPPORTED
#add the locales you want (for example fr) :
sudo locale-gen ru_RU
sudo locale-gen ru_RU.UTF8
#update locales
sudo update-locale

# APACHE - redirect www to non-www
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

# APACHE redirect non-www to www

<VirtualHost *:80>
    ServerName mysite.com
    Redirect permanent / http://www.mysite.com/
</VirtualHost>

# rename files having spaces with dashes
rename 's/ /_/g' *

# find string in files and replace
sed -i 's/old-word/new-word/g' *.txt

# switch to mariadb
sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
sudo add-apt-repository 'deb ftp://ftp.ulak.net.tr/pub/MariaDB/repo/5.5/ubuntu precise main'
sudo apt-get install mariadb-server-5.5 mariadb-client-5.5 libmysqlclient18="5.5.35+maria-1~precise" mysql-common="5.5.35+maria-1~precise"

// http://stackoverflow.com/questions/3513773/change-mysql-default-character-set-to-utf8-in-my-cnf?lq=1
collation-server = utf8_turkish_ci
init-connect='SET NAMES utf8'
character-set-server = utf8

# copying all from remote ftp
wget -m ftp://username:[email protected]



## mySQL #############################################################

# optimize all tables
mysqlcheck -o <db_schema_name>


## fstab bind mount
/opt/var_log /var/log none bind 0 0