1. Getting started with CentOS Linux
Sergey Sukhonosov, Dr. Sergey Belov
National Oceanographic Data Centre, Russia

2. Logging In Login: jboss Password: password Login: root
Switch user to root: su
Switch back from root to jboss
exit

3. Running processes Check if JBoss is running: ps –ef | grep java
Check if PostgreSQL is running:
ps –ef | grep java

4. Running processes
View all running processes:
top

5. Start/Stop JBoss AS Start JBoss AS:
$JBOSS_HOME/bin/jboss_init_redhat.sh start
Stop JBoss AS:
$JBOSS_HOME/bin/jboss_init_redhat.sh stop

6. Start/Stop PostgreSQL
Start PostgreSQL :
service postgresql-8.4 start
Stop PostgreSQL :
service postgresql-8.4 stop

7. Browsing local filesystem
Print the content of a file
cat filename
Change the local working directory
cd directory
List file names in a local directory
ls or ll
Print the local working directory
pwd

8. File operations Copy a file or directory cp source destination
Create a directory in local file system
mkdir directory
Rename a file or directory
mv source destination
Remove a file
rm file
Remove a directory
rm –r directory

9. Viewing files from the shell
Display the beginning of a file
head filename
Display first N lines of a file
head –N filename (Ex.: head -20 filename)
Display the end of a file
tail filename (tail –N filename)
The more command is a "pager" utility used to view text in the terminal window one page or screen at a time. The [Space] bar moves forward one page and [Q] quits.

10. Editing files with editor vi
Open file for editing:
vi filename
To start editing press INSERT key
To stop editing press ESC key
To exit vi and save changes
:wq
To exit vi without saving changes
:q!

11. Shutdown virtual machine
To shutdown vm correctly type command logging as root user:
shutdown –h now

12. Questions?