We use the
chmod
command to
change the access
mode of a file. This command comes in many flavors, but
we'll be talking primarily about one of them.
chmod who=permissions filename
This gives “
who” the specified
permissions
for a given
filename.
Who
The “who” is a list of letters that specifies whom you’re
going to be giving permissions to. These may be specified in any order.
Letter | Meaning |
u |
The user who owns the file (this means “you.”)
|
g |
The group the file belongs to.
|
o |
The other users
|
a |
all of the above (an abbreviation for ugo )
|
Permissions
Of course, the permissions are the same letters that you
see in the directory listing:
r |
Permission to read the file.
|
w |
Permission to write (or delete) the file.
|
x |
Permission to execute the file, or, in
the case of a directory, search it.
|
Note: Do not put blanks around the equal sign, or your
command will not work!
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