wipefs: add -t <list> option

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 26 insertions, 6 deletions

diff --git a/misc-utils/wipefs.8 b/misc-utils/wipefs.8
index 1f3d99650..c31cace45 100644
--- a/misc-utils/wipefs.8
+++ b/misc-utils/wipefs.8
@@ -4,25 +4,40 @@
 .\"
 .TH WIPEFS 8 "October 2009" "util-linux" "System Administration"
 .SH NAME
-wipefs \- wipe a filesystem signature from a device
+wipefs \- wipe a signature from a device
 .SH SYNOPSIS
 .B wipefs
-.RB [ \-ahnpV ]
+.RB [ \-ahnptV ]
 .RB [ \-o
 .IR offset ]
 .I device
 .SH DESCRIPTION
 .B wipefs
-can erase filesystem or raid signatures (magic strings) from the specified
+can erase filesystem, raid or partition table signatures (magic strings) from
+the specified
 .I device
-to make the filesystem invisible for libblkid.
+to make the signature invisible for libblkid.
+
 .B wipefs
 does not erase the filesystem itself nor any other data from the device.
 When used without options \fB-a\fR or \fB-o\fR, it lists all visible filesystems
-and the offsets of their signatures.
+and the offsets of their basic signatures.
+
+Note that some filesystems or some partition tables store more magic strings on
+the devices. The
+.B wipefs
+lists the first offset where a magic string has been detected. The device is
+not scanned for additional magic strings for the same filesystem. It's possible
+that after \fBwipefs -o <offset>\fR will be the same filesystem or partition
+table visible by another magic string on another offset.
+
+When used with option \fB-a\fR then all for libblkid visible magic strings are
+erased.
+
 .SH OPTIONS
 .IP "\fB\-a, \-\-all\fP"
-Erase all available signatures.
+Erase all available signatures. This set of erased signatures could be
+restricted by \fB\-t <list>\fP option.
 .IP "\fB\-h, \-\-help\fP"
 Print help and exit.
 .IP "\fB\-n, \-\-no\-act\fP"
@@ -38,6 +53,11 @@ GiB, TiB, PiB and EiB (the "iB" is optional, e.g. "K" has the same meaning as
 .IP "\fB\-p, \-\-parsable\fP"
 Print out in parsable instead of printable format.  Encode all potentially unsafe
 characters of a string to the corresponding hex value prefixed by '\\x'.
+.IP "\fB\-t, \-\-types\fP \fIlist\fP
+Used to limit the set of printed or erased signatures. More than one type may
+be specified in a comma-separated list.  The list of types or individual types
+can be prefixed with 'no' to specify the types on which no action should be
+taken. For more details see mount(8).
 .IP "\fB\-V, \-\-version\fP"
 Output version information and exit.
 .SH AUTHOR