Linux usefull Commands for Oracle Dba

Unix Commands


Windows - DOS - Command line interpreter
Redhat - Unix - Cli

Many flavours

Redhat - 90% - 8,7.10
Oracle Linux (same redhat)
AIX(IBM)
Solaris (Oracle)
Ubunto (Open Source)
Centos(O-S)
HP-Unix (HP)

Terminal

On Desktop - > right click - > Open Terminal

Finding hostname/servers/host/device/box/asset
#hostname

Finding ipaddress
#ifconfig

in windows : ipconfig


Finding usage
#df -h

In kilobytes
#df -k


Changing Directory
#cd /softwares

#cd /orabackup

Present working directory
#pwd

Listing files and folders
#ls
with details

What permissions/file/folder/owner/group/public?

#ls -ltr
eg:
drwxr-xr-x   root    root    testd
-rwxr--r--   oracle  oinstall  testf

The first character defines

d - ?   directory / folder
- - ?   file

r - read
w - write
x - execute

Owner group public
rwx r-x r-x
root root all

rwx r-- r--
oracle   oinstall all



Creating empty file
#touch testfile

If your filesystem goes in to read only mode,
to test it , will create empty file with touch.

Inform to system admin team

Creating/Make Directory/folder
#mkdir testd

Removing a Directory
#rmdir testd

Removing a file
#rm testfile

move to previous directory
#cd ..

Removing a directory with subfiles and folders
#rm -rf testd

Note:
-r  ? recursive ( including subfiles and folders)
-f  ? force

Copying a file
#cp testfile /orabackup

Moving afile / Renaming a file
#mv testfile testf
or
#mv testfile /orabackup