Apple Mac OS X Server Changing Permissions, Use the chmod tool to change permissions for an item

This command affects the permissions on files and folders created by programs that respect the Mac OS X NSUmask settings. Programs should follow the value set for NSUmask, but there is no guarantee that they will. Also, users can override their own NSUmask setting at any time. The changes to the umask settings take effect at next login.

Warning: Setting permissions to group, or all, will allow any private, or confidential information in these folders to be visible to others. To prevent private files being accessed, the user should create a folder and restrict the permissions.

Changing Permissions

Use the chmod tool to change permissions for an item.

$ chmod securitygroup changetype permission fileorfolder

Parameter	Description
securitygroup	The person or group whose permission you are changing. Can be
	any of the following:
	Â u - user
	Â g - group
	Â o - other
	Â all - all
changetype	Type of change. Whether you are adding or subtracting the
	permission:
	Â “+” - add permission
	Â “-” - subtract permission
permission	The permission you are changing:
	Â r - read
	Â w - write
	Â x - execute
fileorfolder	The name of the file or folder to change.

To remove write access permission for group and others from the file myfile:

$ chmod go-w myfile

To add read and write access permission for group and others to files myfile1 and myfile2:

$ chmod go+rw myfile1 myfile2

To add read, write, and execute permission for everyone to myfile1:

$ chmod ugo+rwx myfile1

See the chmod man page for more information.

Chapter 8 Working with Users and Groups

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