Unix commands for DBAs - Part 1

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#                       LISTING FILES & DIRECTORIES
#----------------------------------------------------------------------------------
ls                      To list the contennts (files/directories) in current working directory
ls -l                   Long listing display (displays owner, group, type of file, modification date/time etc.) 
ls -la                  Long list + hidden files and directories (starts with .) 
ls -lar                 Long list + hidden files + sort by reverse modification date/time 
ls -lR                  Recursive long list 

#----------------------------------------------------------------------------------
#                        CHANGING DIRECTORIES
#----------------------------------------------------------------------------------
cd                      Move to home directory
cd ..                   Move to one dirctory back
cd ../..                Move two levels of back directory
cd /export/home/oracle  Move to Oracle's home directory
cd ~oracle              Move to Oracle's home directort (in KSH shell)
pwd                     Shows present working directory 

#----------------------------------------------------------------------------------
#                          FINDING FILES (variuos examples)
#----------------------------------------------------------------------------------
find / -name filename
find / -name *.log
find / -name filename -type f
find / -name filename -size +10000c
find / -name filename -mtime +10
find / -name filename -xdev
find / -name filename -exec ls -l '{}' \;
find / -name filename -exec rm '{}' \;

#----------------------------------------------------------------------------------
#                         MISCELLENEOUS COMMANDS
#----------------------------------------------------------------------------------
mkdir abc               Make directory 'abc' in current directory
mkdir -p /tmp/d1/d2/d3  Make recursive directories d1->d2->d3
cp source destination   Make copy of 'source' file to 'destination' file
cp -r dir1 dir1         Make a directory copy (recursive copy)
cp -pr dir1 dir2        Make a directory copy with retaining date/time (recursive copy)
mv file1 file2          Rename 'file1' to 'file2'
mv dir1 dir2            Rename directory name from 'dir1' to 'dir2'

#----------------------------------------------------------------------------------
#                            FILES/DIRECTORY DELETION
#----------------------------------------------------------------------------------
rm file1                Delete 'file1'
rm -i file1             Delete 'file1' - interactively
rm -f file1             Delete 'file1' - forcefully 
rm -r dir1              Delete 'dir1' directory - recursively
rmdir dir1              Delete an empty directory 'dir1'