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   ext2    ( 5 )

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Атрибуты файлов (File attributes)

The ext2, ext3, and ext4 file systems support setting the
       following file attributes on Linux systems using the chattr(1)
       utility:

       a - append only

       A - no atime updates

       d - no dump

       D - synchronous directory updates

       i - immutable

       S - synchronous updates

       u - undeletable

       In addition, the ext3 and ext4 file systems support the following
       flag:

       j - data journaling

       Finally, the ext4 file system also supports the following flag:

       e - extents format

       For descriptions of these attribute flags, please refer to the
       chattr(1) man page.