一、訪問控制列表
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1.1、setfacl命令
[root@localhost /home/data]#whatis setfacl
setfacl (1) - set file access control lists
[root@localhost /home/data]#setfacl --help
setfacl 2.2.51 -- set file access control lists
Usage: setfacl [-bkndRLP] { -m|-M|-x|-X ... } file ...
-m, --modify=acl modify the current ACL(s) of file(s)
-M, --modify-file=file read ACL entries to modify from file
-x, --remove=acl remove entries from the ACL(s) of file(s)
-X, --remove-file=file read ACL entries to remove from file
-b, --remove-all remove all extended ACL entries
-k, --remove-default remove the default ACL
--set=acl set the ACL of file(s), replacing the current ACL
--set-file=file read ACL entries to set from file
--mask do recalculate the effective rights mask
-n, --no-mask don't recalculate the effective rights mask
-d, --default operations apply to the default ACL
-R, --recursive recurse into subdirectories
-L, --logical logical walk, follow symbolic links
-P, --physical physical walk, do not follow symbolic links
--restore=file restore ACLs (inverse of `getfacl -R')
--test test mode (ACLs are not modified)
-v, --version print version and exit
-h, --help this help text
[root@localhost /home/data]#ll
total 4
-rw-r----- 1 root root 465 Jul 3 17:54 a.txt
-rw-rw-r-- 1 missbe missbe 0 Jul 3 18:04 b.txt
-rw-r--r-- 1 unnet unnet 0 Jul 3 17:29 c.txt
[root@localhost /home/data]#setfacl -m u:missbe:- c.txt
[root@localhost /home/data]#su missbe
[missbe@localhost /home/data]$cat c.txt
cat: c.txt: Permission denied
1.2、getfacl命令
[missbe@localhost /home/data]$whatis getfacl
getfacl (1) - get file access control lists
[missbe@localhost /home/data]$getfacl --help
getfacl 2.2.51 -- get file access control lists
Usage: getfacl [-aceEsRLPtpndvh] file ...
-a, --access display the file access control list only
-d, --default display the default access control list only
-c, --omit-header do not display the comment header
-e, --all-effective print all effective rights
-E, --no-effective print no effective rights
-s, --skip-base skip files that only have the base entries
-R, --recursive recurse into subdirectories
-L, --logical logical walk, follow symbolic links
-P, --physical physical walk, do not follow symbolic links
-t, --tabular use tabular output format
-n, --numeric print numeric user/group identifiers
-p, --absolute-names don't strip leading '/' in pathnames
-v, --version print version and exit
-h, --help this help text
[missbe@localhost /home/data]$getfacl c.txt
# file: c.txt
# owner: unnet
# group: unnet
user::rw-
user:missbe:---
group::r--
mask::r--
other::r--
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mask類似掩碼，user、group的權限不能高于mask的權限[類似于掩碼異或]
