Command Section
RMEXTATTR(8)            FreeBSD System Manager's Manual           RMEXTATTR(8)

     getextattr, lsextattr, rmextattr, setextattr - manipulate extended

     getextattr [-fhqsx] attrnamespace attrname filename ...
     lsextattr [-fhq] attrnamespace filename ...
     rmextattr [-fhq] attrnamespace attrname filename ...
     setextattr [-fhnq] attrnamespace attrname attrvalue filename ...
     setextattr -i [-fhnq] attrnamespace attrname filename ...

     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.

     -i      (From stdin.)  Read attribute data from stdin instead of as an

     -n      (NUL-terminate.)  NUL-terminate the extent content written out.

     -q      (Quiet.)  Do not print out the pathname and suppress error
             messages.  When given twice, print only the attribute value, with
             no trailing newline.

     -s      (Stringify.)  Escape nonprinting characters and put quotes around
             the output.

     -x      (Hex.)  Print the output in hexadecimal.

     setextattr system md5 `md5 -q /boot/kernel/kernel` /boot/kernel/kernel
     md5 -q /boot/kernel/kernel | setextattr -i system md5 /boot/kernel/kernel
     getextattr system md5 /boot/kernel/kernel
     getextattr -qq system md5 /boot/kernel/kernel | od -x
     lsextattr system /boot/kernel/kernel
     rmextattr system md5 /boot/kernel/kernel

     extattr(2), extattr(3), extattrctl(8), extattr(9)

     Extended attribute support was developed as part of the TrustedBSD
     Project, and introduced in FreeBSD 5.0.  It was developed to support
     security extensions requiring additional labels to be associated with
     each file or directory.

     Robert N M Watson
     Poul-Henning Kamp

FreeBSD 11.1-RELEASE-p4         April 27, 2016         FreeBSD 11.1-RELEASE-p4
Command Section