80 lines
2.8 KiB
Groff
80 lines
2.8 KiB
Groff
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.50.1.
|
|
.TH SHRED "1" "April 2025" "GNU coreutils 9.7" "User Commands"
|
|
.SH NAME
|
|
shred \- overwrite a file to hide its contents, and optionally delete it
|
|
.SH SYNOPSIS
|
|
.B shred
|
|
[\fI\,OPTION\/\fR]... \fI\,FILE\/\fR...
|
|
.SH DESCRIPTION
|
|
.\" Add any additional description here
|
|
.PP
|
|
Overwrite the specified FILE(s) repeatedly, in order to make it harder
|
|
for even very expensive hardware probing to recover the data.
|
|
.PP
|
|
If FILE is \-, shred standard output.
|
|
.PP
|
|
Mandatory arguments to long options are mandatory for short options too.
|
|
.TP
|
|
\fB\-f\fR, \fB\-\-force\fR
|
|
change permissions to allow writing if necessary
|
|
.TP
|
|
\fB\-n\fR, \fB\-\-iterations\fR=\fI\,N\/\fR
|
|
overwrite N times instead of the default (3)
|
|
.TP
|
|
\fB\-\-random\-source\fR=\fI\,FILE\/\fR
|
|
get random bytes from FILE
|
|
.TP
|
|
\fB\-s\fR, \fB\-\-size\fR=\fI\,N\/\fR
|
|
shred this many bytes (suffixes like K, M, G accepted)
|
|
.TP
|
|
\fB\-u\fR
|
|
deallocate and remove file after overwriting
|
|
.TP
|
|
\fB\-\-remove\fR[=\fI\,HOW\/\fR]
|
|
like \fB\-u\fR but give control on HOW to delete; See below
|
|
.TP
|
|
\fB\-v\fR, \fB\-\-verbose\fR
|
|
show progress
|
|
.TP
|
|
\fB\-x\fR, \fB\-\-exact\fR
|
|
do not round file sizes up to the next full block;
|
|
this is the default for non\-regular files
|
|
.TP
|
|
\fB\-z\fR, \fB\-\-zero\fR
|
|
add a final overwrite with zeros to hide shredding
|
|
.TP
|
|
\fB\-\-help\fR
|
|
display this help and exit
|
|
.TP
|
|
\fB\-\-version\fR
|
|
output version information and exit
|
|
.PP
|
|
Delete FILE(s) if \fB\-\-remove\fR (\fB\-u\fR) is specified. The default is not to remove
|
|
the files because it is common to operate on device files like \fI\,/dev/hda\/\fP,
|
|
and those files usually should not be removed.
|
|
The optional HOW parameter indicates how to remove a directory entry:
|
|
\&'unlink' => use a standard unlink call.
|
|
\&'wipe' => also first obfuscate bytes in the name.
|
|
\&'wipesync' => also sync each obfuscated byte to the device.
|
|
The default mode is 'wipesync', but note it can be expensive.
|
|
.PP
|
|
CAUTION: shred assumes the file system and hardware overwrite data in place.
|
|
Although this is common, many platforms operate otherwise. Also, backups
|
|
and mirrors may contain unremovable copies that will let a shredded file
|
|
be recovered later. See the GNU coreutils manual for details.
|
|
.SH AUTHOR
|
|
Written by Colin Plumb.
|
|
.SH "REPORTING BUGS"
|
|
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
|
|
.br
|
|
Report any translation bugs to <https://translationproject.org/team/>
|
|
.SH COPYRIGHT
|
|
Copyright \(co 2025 Free Software Foundation, Inc.
|
|
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
|
|
.br
|
|
This is free software: you are free to change and redistribute it.
|
|
There is NO WARRANTY, to the extent permitted by law.
|
|
.SH "SEE ALSO"
|
|
Full documentation <https://www.gnu.org/software/coreutils/shred>
|
|
.br
|
|
or available locally via: info \(aq(coreutils) shred invocation\(aq
|