Figure 4.10 umask
Mask bit
Meaning
0400
user-read
0200
user-write
0100
user-execute
0040
group-read
0020
group-write
0010
group-execute
0004
other-read
0002
other-write
0001
other-execute
$ umask first print the current file mode creation mask002$ umask -S print the symbolic formu=rwx,g=rwx,o=rx$ umask 027 change the file mode creation mask$ umask -S print the symbolic formu=rwx,g=rx,o=
//=================================================//
mode
Description
S_ISUID
set-user-ID on execution
S_ISGID
set-group-ID on execution
S_ISVTX
saved-text (sticky bit)
S_IRWXU
read, write, and execute by user (owner)
S_IRUSR
read by user (owner)
S_IWUSR
write by user (owner)
S_IXUSR
execute by user (owner)
S_IRWXG
read, write, and execute by group
S_IRGRP
read by group
S_IWGRP
write by group
S_IXGRP
execute by group
S_IRWXO
read, write, and execute by other (world)
S_IROTH
read by other (world)
S_IWOTH
write by other (world)
S_IXOTH
execute by other (world)
S_IRWXO的全称是什么呢？哦，是这样啊 set-group-ID or a set-user-ID ，一看就明白了
S: set
I: ID
RWX: read,write,execute
O: other
设定other这个项的file permission ID 是read , write, execute。
今天的长相厮守，只是尽力而为而已。
