To Change the permissions On Unix

To Change the permissions On Unix
Unix permissions
Unix permission



666 : Default permission
002 : - umask value
664 : final permission




#=root


# chmod 777 *.log


u user
g group
o others



Owner Group others Permission
========= ========= ========= ======================
7 (u+rwx) 7 (g+rwx) 7 (o+rwx) read + write + execute
6 (u+wx) 6 (g+wx) 6 (o+wx) write + execute
5 (u+Rx) 5 (g+Rx) 5 (o+Rx) read + execute
4 (u+r) 4 (g+r) 4 (o+r) read only
2 (u+w) 2 (g+w) 2 (o+w) write only
1 (u+x) 1 (g+x) 1 (o+x) execute only


Character equivalents can be used in the chmod command .




#chmod o+rwx *.log
#chmod g+r *.log
#chmod -Rx *.log

chmod -R g+rw hft/



-R recursive

# chown -R oinstall.dba *



Owner Group The others Permission

7 7 7 read + write + execute
6 6 6 write + execute
5 5 5 read + execute
4 4 4 read only
2 2 2 write only
1 1 1 execute only

Oracle Create Soft link

-bash-3.2$ pwd
/usr/lib/oracle/instantclient10_1
-bash-3.2$ ls -ltr libclntsh*
-rwxr-xr-x 1 oracle oinstall 15306239 Dec 7 2005 libclntsh.so.10.1
lrwxrwxrwx 1 oracle dba 17 Jun 22 10:46 libclntsh.so -> libclntsh.so.10.1


ln -s libclntsh.so.10.1 libclntsh.so.11.1

-bash-3.2$ ls -ltr libclntsh*
-rwxr-xr-x 1 oracle oinstall 15306239 Dec 7 2005 libclntsh.so.10.1
lrwxrwxrwx 1 oracle dba 17 Jun 22 10:46 libclntsh.so -> libclntsh.so.10.1
lrwxrwxrwx 1 oracle dba 17 Jun 23 09:28 libclntsh.so.11.1 -> libclntsh.so.10.1
-bash-3.2$