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    Command:

    attr

    
    
    

    SYNOPSIS

           attr [ -LRSq ] -s attrname [ -V attrvalue ] pathname
    
           attr [ -LRSq ] -g attrname pathname
    
           attr [ -LRSq ] -r attrname pathname
    
           attr [ -LRSq ] -l pathname
    
    
    

    OVERVIEW

           Extended  attributes  implement  the  ability  for  a  user  to  attach
           name:value pairs to objects within the XFS filesystem.
    
           This document describes the attr command, which  is  mostly  compatible
           with  the IRIX command of the same name.  It is thus aimed specifically
           at users of the XFS filesystem - for  filesystem  independent  extended
           attribute  manipulation,  consult the getfattr(1) and setfattr(1) docu-
           mentation.
    
           Extended attributes can be used to  store  meta-information  about  the
           file.   For example "character-set=kanji" could tell a document browser
           to use the Kanji  character  set  when  displaying  that  document  and
           "thumbnail=..."  could  provide a reduced resolution overview of a high
           resolution graphic image.
    
           In the XFS filesystem, the names can be up to 256 bytes in length, ter-
           minated  by  the  first  0  byte.  The intent is that they be printable
           ASCII (or other character set) names for the attribute.  The values can
           be up to 64KB of arbitrary binary data.
    
           Attributes  can  be attached to all types of XFS inodes: regular files,
           directories, symbolic links, device nodes, etc.
    
           XFS uses  2  disjoint  attribute  name  spaces  associated  with  every
           filesystem  object.   They  are  the root and user address spaces.  The
           root address space is accessable only to the superuser, and  then  only
           by  specifying  a flag argument to the function call.  Other users will
           not see or be able to modify attributes in the root address space.  The
           user  address  space is protected by the normal file permissions mecha-
           nism, so the owner of the file can decide who is  able  to  see  and/or
           modify the value of attributes on any particular file.
    
    
    

    DESCRIPTION

           The attr utility allows the manipulation of extended attributes associ-
           ated with filesystem objects from within shell scripts.
    
           There are four main operations that attr can perform:
    
           GET    The -g attrname option tells attr to search the named object and
                  print (to ssttddoouutt) the value associated with that attribute name.
                  With the -q flag, ssttddoouutt will be exactly and only the  value  of
                  The -s attrname option tells attr to set the named attribute  of
                  the  object  to the value read from ssttddiinn.  If an attribute with
                  that name already exists, its value will be replaced  with  this
                  one.  If an attribute with that name does not already exist, one
                  will be created with this value.  With the  -V  attrvalue  flag,
                  the attribute will be set to have a value of attrvalue and ssttddiinn
                  will not be read.  With the -q flag, ssttddoouutt will  not  be  used.
                  Without  the  -q  flag, a message showing the attribute name and
                  the entire value will be printed.
    
           When the -L option is given and the named object is  a  symbolic  link,
           operate  on  the  attributes  of  the object referenced by the symbolic
           link.  Without this option, operate on the attributes of  the  symbolic
           link itself.
    
           When the -R option is given and the process has appropriate privileges,
           operate in the root attribute namespace rather that the USER  attribute
           namespace.
    
           The  -S  option  is  similar,  except  it specifies use of the security
           attribute namespace.
    
           When the -q option is given attr will try to keep quiet.  It will  out-
           put  error  messages (to ssttddeerrrr) but will not print status messages (to
           ssttddoouutt).
    
    
    

    NOTES

           The standard file interchange/archive programs tar(1), and cpio(1) will
           not  archive  or restore extended attributes, while the xfsdump(8) pro-
           gram will.
    
    
    

    CAVEATS

           The list option present in the IRIX version of this command is not sup-
           ported.  getfattr provides a mechanism to retrieve all of the attribute
           names.
    
    
    

    SEE ALSO

           getfattr(1),  setfattr(1),  attr_get(3),  attr_set(3),   attr_multi(3),
           attr_remove(3), attr(5), and xfsdump(8).
    
    
    

    Dec 2001 Extended Attributes ATTR(1)

    
    
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