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ls -rw-r--r-- 1 oracle dba chmod 777 test.txt ls -rwxrwxrwx 1 oracle dba
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The file test.txt initially had its file permissions set to 644 (rw, r, r.) The command chmod 777 assigned full permissions (read, write, and execute) to all three entities: owner, group, and all others. If you want to change this so that only the owner has complete rights and the others have no permissions at all, set the octal number to 700 (read, write, and execute permissions for the owner, and no permissions at all for the group or others) and use the chmod command as follows: $ chmod 700 test.txt $ ls -altr test.txt -rwx-----1 oracle $
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Table 3-3 provides a short summary of the commands you can use to change file permissions. By default, all files come with read and write privileges assigned, and directories come with read, write, and execute privileges turned on.
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Table 3-3. UNIX Permissions in Symbolic Notation and Octal Numbers
Symbolic Notation
----x -w-wx r-r-x rwrwx
Octal Number
0 1 2 3 4 5 6 7
Privilege Description
No privileges Execute only Write only Write and execute, no read Read only Read and execute, no write Read and write, no execute Read, write, and execute (full privileges)
The UMASK environment variable determines the default file and directory permissions. Issue the following command to see the current defaults on your server: $ umask 022 When you create a new file, it ll have the default permissions allowed by the UMASK variable. In the preceding example, the UMASK is shown to be 022, meaning that the group and others don t have write permissions by default on any new file that you create.
CHAPTER 3 ES SEN TIAL UN IX (AN D LINUX) FOR THE ORA CLE DBA
Changing the Group
You can change the group a file belongs to by using the chgrp command. You must be the owner of the file to change the group, and you can change the file s group only to a group that you belong to. Here s how you use the chgrp command: $ chgrp groupname filename
Directory Management
There are two facets to directory management. One is that you simply need to know the commands involved in creating, moving, and deleting directories. The other is that you need to know about certain standard directories that you tend to find on just about every UNIX and Linux system that you will encounter.
Manipulating Directories
There are several important directory commands that enable you to create, move, and delete directories. The mkdir command lets you create a new directory: $ mkdir newdir You can use the mkdir command with the -p option to create any necessary intermediate directories if they don t already exist. The following example creates the directory /u01/, the directory /u01/app, and the directory /u01/app/oracle, all with a single command: $ mkdir -p /u01/app/oracle
The command for removing directories is not the same as the command for removing files. To remove a directory, you can use the rmdir command, as in the following example (but first make sure you have removed all the files in the directory using the rm command): $ rmdir testdir The rmdir command only removes empty directories. To remove a directory that contains files, use the rm command with the -R (or -r) option. This command will recursively delete the entire contents of a directory before removing the directory itself: $ rmdir -r newdir To move around the UNIX hierarchical directory structure, use the cd command (which stands for change directory ). $ pwd /u01/app/oracle $ cd /u01/app/oracle/admin $ cd /u01/app/oracle $ cd admin $ pwd /u01/app/oracle/admin $ Notice that you can use the cd command with the complete absolute path or with the shorter relative path. You can also use it to change to a directory that is indicated by an environment variable. For example, cd $ORACLE_HOME will change your current directory to the directory that happens to be the location for ORACLE_HOME.
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