.\"
.TH DUMPE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
.SH NAME
-dumpe2fs \- dump ext2/ext3 filesystem information
+dumpe2fs \- dump ext2/ext3/ext4 filesystem information
.SH SYNOPSIS
.B dumpe2fs
[
-.B \-bfhixV
+.B \-bfghixV
]
[
.B \-o superblock=\fIsuperblock
present on
.I device.
.PP
-.B dumpe2fs
-is similar to Berkeley's
-.B dumpfs
-program for the BSD Fast File System.
+.B Note:
+When used with a mounted filesystem, the printed
+information may be old or inconsistent.
.SH OPTIONS
.TP
.B \-b
force dumpe2fs to display a filesystem even though it may have some
filesystem feature flags which dumpe2fs may not understand (and which
can cause some of dumpe2fs's display to be suspect).
+.TP
+.B \-g
+display the group descriptor information in a machine readable colon-separated
+value format. The fields displayed are the group number; the number of the
+first block in the group; the superblock location (or -1 if not present); the
+range of blocks used by the group descriptors (or -1 if not present); the block
+bitmap location; the inode bitmap location; and the range of blocks used by the
+inode table.
.TP
.B \-h
only display the superblock information and not any of the block
.SH SEE ALSO
.BR e2fsck (8),
.BR mke2fs (8),
-.BR tune2fs (8)
+.BR tune2fs (8).
+.BR ext4 (5)