Linux usual commands

• change rights recursive:
chmod -R 775 file
• change owner recursive: chown -R user:group file
• Process analyze:          # ps -A and # top , ps -fax
• Remove package:        apt-get --purge remove package
• memory info:                  free -m
• Set timezone in ubuntu:  dpkg-reconfigure tzdata
• Extract tar archive :        tar jxvf archive.tar.bz2
• Create tar.gz archive preserving permisions  

  tar -pczf name_of_your_archive.tar.gz /path/to/directory

• Uncompress:  tar zxf archive.tar.gz
• uncompress bziped:  tar jxf archive.tar.bz2

• Add group # groupadd groupname
• Add user # useradd username
• User Info  # id username
• Add existing user to group www-data

# usermod -a -G www-data username

• Install imagemagik: # apt-get install imagemagick --fix-missing
• Ubutu timezone set: first delete old timezone and make la link to correct timezone file

rm /etc/localtime
ln /usr/share/zoneinfo/Europe/Bucharest /etc/localtime
or

ln -sf /usr/share/zoneinfo/Europe/Bucharest /etc/localtime

• install apc for php

aptitude install php-apc

See size of folder

         du -ch folder/ | grep total

Repair optimize all databases

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

Control start-up processes

sysv-rc-conf

copy files from one server to another using scp ssh

scp -r /home/folder root@server2.com:/home/user/public_html

copy database remote

 mysqldump db-name | ssh user@server.com mysql db-name

or

mysqldump -u username -p'password' db-name | ssh user@server.com mysql -u username -p'password' db-name

compress remote using tar over ssh 

tar zcvf - /var/www/user/ | ssh root@server.com "cat > /home/user.tar.gz"

see apache modules

/usr/sbin/apache2 -l

remove ssh key from known_hosts file

ssh-keygen -R hostname

version of ubuntu: lsb_release -a 

see if 64bit os: uname -a

mysql repair all tables

mysqlcheck -u username -p --auto-repair --optimize --all-databases