chacl - change the access control list of a file or directory
chacl acl pathname...
chacl -b acl dacl pathname...
chacl -d dacl pathname...
chacl -R pathname...
chacl -D pathname...
chacl -B pathname...
chacl changes the Access Control List (see acl(4)) for a file or
directory. The -b flag indicates that there are two ACLs, the first is
the file access ACL and the second the directory default ACL. The -d flag
is used to set only the default ACL of a directory. The -R and -D flags
are used to remove the file access ACL and directory default ACL
respectively, the -B flag will remove all ACLs. The ACL(s) specified are
applied to each file in the pathname arguments.
Each ACL is a string which is processed via acl_from_text(3c). These
strings are made up of comma separated clauses each of which is of the
form, tag:name:perm. Where tag can be
"user" (or "u")
indicating that the entry is a user ACL entry.
"group" (or "g")
indicating that the entry is a group ACL entry.
"other" (or "o")
indicating that the entry is an other ACL entry.
"mask" (or "m")
indicating that the entry is a mask ACL entry.
name is a string which is the user or group name for the ACL entry. A
null name in a user or group ACL entry indicates the file's owner or
file's group. perm is the string "rwx" where each of the entries may be
replaced by a "-" indicating no access of that type, e.g. "r-x", "--x",
A minimum ACL: chacl u::rwx,g::r-x,o::r-- file
The file ACL is set so that the file's owner has rwx, the file's group
has read and execute, and others have read only access to the file.
An ACL that is not a minimum ACL, that is, one that specifies a user or
group other than the file's owner or owner's group, must contain a mask
entry: chacl u::rwx,g::r-x,o::r--,u:guest:r--,m::r-x file1 file2
You can use the output of ls -D to get the ACL argument to chacl. To set
the default and access ACLs on newdir to be the same as on oldir, you
chacl -b `ls -dD olddir | sed -e 's/.*\[//' -e 's#/# #' -e 's/]$//'`
chacl replaces the existing ACL. To add or delete entries, you must
first do ls -D to get the existing ACL, and use the output to form the
arguments to chacl.
Changing the permission bits of a file will change the file access ACL
settings (see chmod(1)). Similarly file-creation mode masks can effect
the access ACL settings of files created using directory default ACLs
ACLs are filesystem extended attributes and are not typically archived or
restored using conventional archiving utilities. See attr(1) for more
information about Extended Attributes and see xfsdump(1m) or tar(1M) (-M
flag) for a method to back them up.
ACLs can not be modified on NFS mounted filesystems unless the filesystem
is exported with root permissions, see exports(4).
acl(4), umask(1), acl_from_text(3c).
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