Some useful commands in Ubuntu

How to take mysql database backup?
mysqldump -u root -p --routines database_name> backup_name.sql

How to import DB?
mysql -u root -p databasename

how to move one folder from one place to another place ?
sudo mv foldername destination_location

how to remove non-empty folder?
sudo rm -r foldername
system shout down command:
sudo init 0
system restart command:
sudo init 6

How to unzip a zip file from the Terminal?
unzip filename.zip -d destination_folder_name
how to know port number local system?
to see port number go to etc/ssh/ssh.config file
default port number is:22
how to stop tomcat server in ubuntu?
ps ax | grep java
to find the java process number. If that command returns something, then run
copy the process id and execute below commnad.
sudo kill -9 pid

Permission denied to start/stop  tomcat server?
go to tomcat/bin run the following command
chmod 700 *.sh
how to know mysql is running or not?
sudo netstat -tap | grep mysql

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