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Getting started with CentOS Linux

Getting started with CentOS Linux. Sergey Sukhonosov, Dr. Sergey Belov National Oceanographic Data Centre, Russia. Login: jboss Password: password. Logging In. Login: root Password: password. Switch user to root : su. Switch back from root to jboss exit. Running processes.

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Getting started with CentOS Linux

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

  2. Login: jboss Password: password Logging In Login: root Password: password 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 –Nfilename) 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?

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