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Some Basic Linux Commands

  Some of the Linux commands which we regularly use in our daily work space

  • mkdir  directory_name     = to create a directory
  • ls -lrt                                 = to view the list of files/directories in any directory
  • vi  file_name                    = to create a new file (or) edit file.  [after creation of file press 'ESC' then                                                'shift key' + :wq! to save the file]   after opening the file click I to                                                         insert the data.
  • cat file_name                   = to view the contents in the file
  • df -kh                               = to view the list of mount points
  • cd mount point name       = to change the directory
  • unname - a                       = to know the platform of software
  • ifconfig -a                        = to know the ip address of server
  • pwd                                  = to know the present working directory
  • cd ..                                  = to move one step backward
  • cd ../..                               = to move two steps backward
  • cp                                     = to copy the content from one file location to another file location
  • mv                                    = to move the content from one file location to another file location
  • hostname                          = to view the hostname of database server
  • unzip                                = to unzip any zip files
  • rm -rf                               = to remove any file or directory be cautious before using this command
  • chown  username            = to change the ownership of the directory or file
  • chmod  775                      = to change the privileges of the directory or file    
  • usermod -g groupname username = to merge user and group name
  • useradd                            = to add username
  • groupadd                         = to add groupname
  • su - root                           = switch to root user
  • ./run file_name               = to run the file
  • ./deinstall                        = to uninstall database software
  • cat /etc/password            = to know how many users are present
  • ps -ef | grep pmon           = it will display whether database is running or not
  • lsnrctl start listner_name = to start the listner process
  • lsnrctl stop listner_name = to stop the listner process
  • ps -ef | grep tns                = to check whether my listner is running or not
  • free -g                              = to show memory details
  • du -sh                               = to know complete size
  • du -sh*                             = to know each file size      


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