06-17-2009
can another user 777 and existing 777 dirctory?
User usrA creates dirA directory and runs chmod 777 on the directory. Can usrB issue another 777 on dirA? It appears the answer is no even if the usrA and usrB are part of the same group. I know this is a rare scenario but I just ran across it and found out that usrB receives an error when attempting issue chmod 777 on an already 777 directory owned by usrA. This is also true for files. I wanted to verify if this is something specific to my env or common in all. Runing on AIX...
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MKFS(1M) MKFS(1M)
NAME
mkfs - construct a file system
SYNOPSIS
/etc/mkfs special proto
DESCRIPTION
Mkfs constructs a file system by writing on the special file special according to the directions found in the prototype file proto. The
prototype file contains tokens separated by spaces or new lines. The first token is the name of a file to be copied onto block zero as the
bootstrap program, see bproc(8). The second token is a number specifying the size of the created file system. Typically it will be the
number of blocks on the device, perhaps diminished by space for swapping. The next token is the number of i-nodes in the i-list. The next
set of tokens comprise the specification for the root file. File specifications consist of tokens giving the mode, the user-id, the group
id, and the initial contents of the file. The syntax of the contents field depends on the mode.
The mode token for a file is a 6 character string. The first character specifies the type of the file. (The characters -bcd specify regu-
lar, block special, character special and directory files respectively.) The second character of the type is either u or - to specify set-
user-id mode or not. The third is g or - for the set-group-id mode. The rest of the mode is a three digit octal number giving the owner,
group, and other read, write, execute permissions, see chmod(1).
Two decimal number tokens come after the mode; they specify the user and group ID's of the owner of the file.
If the file is a regular file, the next token is a pathname whence the contents and size are copied.
If the file is a block or character special file, two decimal number tokens follow which give the major and minor device numbers.
If the file is a directory, mkfs makes the entries . and .. and then reads a list of names and (recursively) file specifications for the
entries in the directory. The scan is terminated with the token $.
If the prototype file cannot be opened and its name consists of a string of digits, mkfs builds a file system with a single empty directory
on it. The size of the file system is the value of proto interpreted as a decimal number. The number of i-nodes is calculated as a func-
tion of the filsystem size. The boot program is left uninitialized.
A sample prototype specification follows:
/usr/mdec/uboot
4872 55
d--777 3 1
usr d--777 3 1
sh ---755 3 1 /bin/sh
ken d--755 6 1
$
b0 b--644 3 1 0 0
c0 c--644 3 1 0 0
$
$
SEE ALSO
filsys(5), dir(5), bproc(8)
BUGS
There should be some way to specify links.
MKFS(1M)