rmextattr(8) [freebsd man page]
RMEXTATTR(8) BSD System Manager's Manual RMEXTATTR(8) NAME
getextattr, lsextattr, rmextattr, setextattr -- manipulate extended attributes SYNOPSIS
getextattr [-fhqsx] attrnamespace attrname filename ... lsextattr [-fhq] attrnamespace filename ... rmextattr [-fhq] attrnamespace attrname filename ... setextattr [-fhnq] attrnamespace attrname attrvalue filename ... DESCRIPTION
These utilities are user tools to manipulate the named extended attributes on files and directories. The attrnamespace argument should be the namespace of the attribute to retrieve: legal values are user and system. The attrname argument should be the name of the attribute, filename the name of the target file or directory, attrvalue a string to store in the attribute. The following options are available: -f (Force.) Ignore errors on individual filenames and continue with the remaining arguments. -h (No follow.) If the file is a symbolic link, perform the operation on the link itself rather than the file that the link points to. -n (NUL-terminate.) NUL-terminate the extent content written out. -q (Quiet.) Do not print out the pathname and suppress error messages. -s (Stringify.) Escape nonprinting characters and put quotes around the output. -x (Hex.) Print the output in hexadecimal. EXAMPLES
setextattr system md5 `md5 -q /boot/kernel/kernel` /boot/kernel/kernel getextattr system md5 /boot/kernel/kernel lsextattr system /boot/kernel/kernel rmextattr system md5 /boot/kernel/kernel SEE ALSO
extattr(2), extattr(3), extattrctl(8), extattr(9) HISTORY
Extended attribute support was developed as part of the TrustedBSD Project, and introduced in FreeBSD 5.0. It was developed to support secu- rity extensions requiring additional labels to be associated with each file or directory. AUTHORS
Robert N M Watson Poul-Henning Kamp BUGS
The setextattr utility can only be used to set attributes to strings. BSD
August 30, 2000 BSD
Check Out this Related Man Page
EXTATTRCTL(8) BSD System Manager's Manual EXTATTRCTL(8) NAME
extattrctl -- manage UFS1 extended attributes SYNOPSIS
extattrctl start path extattrctl stop path extattrctl initattr [-f] [-p path] attrsize attrfile extattrctl showattr attrfile extattrctl enable path attrnamespace attrname attrfile extattrctl disable path attrnamespace attrname DESCRIPTION
The extattrctl utility is the management utility for extended attributes over the UFS1 file system. It allows the starting and stopping of extended attributes on a file system, as well as initialization of attribute backing files, and enabling and disabling of specific extended attributes on a file system. The first argument on the command line indicates the operation to be performed. Operation must be one of the following: start path Start extended attribute support on the file system named using path. The file system must be an UFS1 file system, and the UFS_EXTATTR kernel option must have been enabled. stop path Stop extended attribute support on the file system named using path. Extended attribute support must previously have been started. initattr [-f] [-p path] attrsize attrfile Create and initialize a file to use as an attribute backing file. You must specify a maximum per-inode size for the attribute in bytes in attrsize, as well as the file where the attribute will be stored, using attrfile. The -f argument may be used to indicate that it is alright to overwrite an existing attribute backing file; otherwise, if the target file exists, an error will be returned. The -p path argument may be used to preallocate space for all attributes rather than relying on sparse files to conserve space. This has the advantage of guaranteeing that space will be available for attributes when they are written, preventing low disk space condi- tions from denying attribute service. This file should not exist before running initattr. showattr attrfile Show the attribute header values in the attribute file named by attrfile. enable path attrnamespace attrname attrfile Enable an attribute named attrname in the namespace attrnamespace on the file system identified using path, and backed by initialized attribute file attrfile. Available namespaces are "user" and "system". The backing file must have been initialized using initattr before its first use. Attributes must have been started on the file system prior to the enabling of any attributes. disable path attrnamespace attrname Disable the attributed named attrname in namespace attrnamespace on the file system identified by path. Available namespaces are "user" and "system". The file system must have attributes started on it, and the attribute most have been enabled using enable. EXAMPLES
extattrctl start / Start extended attributes on the root file system. extattrctl initattr 17 /.attribute/system/md5 Create an attribute backing file in /.attribute/system/md5, and set the maximum size of each attribute to 17 bytes, with a sparse file used for storing the attributes. extattrctl enable / system md5 /.attribute/system/md5 Enable an attribute named md5 on the root file system, backed from the file /.attribute/system/md5. extattrctl disable / md5 Disable the attribute named md5 on the root file system. extattrctl stop / Stop extended attributes on the root file system. SEE ALSO
ffs(7), getextattr(8), setextattr(8), extattr(9) HISTORY
Extended attribute support was developed as part of the TrustedBSD Project, and introduced in FreeBSD 5.0. It was developed to support secu- rity extensions requiring additional labels to be associated with each file or directory. AUTHORS
Robert N M Watson BSD
March 30, 2000 BSD