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<p>CPIO(1) BSD General Commands Manual CPIO(1)</p>
<p style="margin-top: 1em"><b>NAME</b></p>
<p style="margin-left:6%;"><b>cpio</b> &mdash; copy files
to and from archives</p>
<p style="margin-top: 1em"><b>SYNOPSIS</b></p>
<p style="margin-left:13%;"><b>cpio -i</b> [<i>options</i>]
[<i>pattern&nbsp;...</i>] [<i>&lt;&nbsp;archive</i>] <b><br>
cpio -o</b> [<i>options</i>] <i>&lt; name-list</i>
[<i>&gt;&nbsp;archive</i>] <b><br>
cpio -p</b> [<i>options</i>] <i>dest-dir &lt;
name-list</i></p>
<p style="margin-top: 1em"><b>DESCRIPTION</b></p>
<p style="margin-left:6%;"><b>cpio</b> copies files between
archives and directories. This implementation can extract
from tar, pax, cpio, zip, jar, ar, and ISO 9660 cdrom images
and can create tar, pax, cpio, ar, and shar archives.</p>
<p style="margin-left:6%; margin-top: 1em">The first option
to <b>cpio</b> is a mode indicator from the following
list:</p>
<p><b>-i</b></p>
<p style="margin-left:17%; margin-top: 1em">Input. Read an
archive from standard input (unless overridden) and extract
the contents to disk or (if the <b>-t</b> option is
specified) list the contents to standard output. If one or
more file patterns are specified, only files matching one of
the patterns will be extracted.</p>
<p><b>-o</b></p>
<p style="margin-left:17%; margin-top: 1em">Output. Read a
list of filenames from standard input and produce a new
archive on standard output (unless overridden) containing
the specified items.</p>
<p><b>-p</b></p>
<p style="margin-left:17%; margin-top: 1em">Pass-through.
Read a list of filenames from standard input and copy the
files to the specified directory.</p>
<p style="margin-top: 1em"><b>OPTIONS</b></p>
<p style="margin-left:6%;">Unless specifically stated
otherwise, options are applicable in all operating
modes.</p>
<p style="margin-top: 1em"><b>-0</b>, <b>--null</b></p>
<p style="margin-left:17%;">Read filenames separated by NUL
characters instead of newlines. This is necessary if any of
the filenames being read might contain newlines.</p>
<p style="margin-top: 1em"><b>-A</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Append to the specified archive. (Not yet implemented.)</p>
<p style="margin-top: 1em"><b>-a</b></p>
<p style="margin-left:17%; margin-top: 1em">(o and p modes)
Reset access times on files after they are read.</p>
<p style="margin-top: 1em"><b>-B</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Block output to records of 5120 bytes.</p>
<p style="margin-top: 1em"><b>-C</b> <i>size</i></p>
<p style="margin-left:17%;">(o mode only) Block output to
records of <i>size</i> bytes.</p>
<p style="margin-top: 1em"><b>-c</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Use the old POSIX portable character format. Equivalent to
<b>--format</b> <i>odc</i>.</p>
<p style="margin-top: 1em"><b>-d</b>,
<b>--make-directories</b></p>
<p style="margin-left:17%;">(i and p modes) Create
directories as necessary.</p>
<p style="margin-top: 1em"><b>-E</b> <i>file</i></p>
<p style="margin-left:17%;">(i mode only) Read list of file
name patterns from <i>file</i> to list and extract.</p>
<p style="margin-top: 1em"><b>-F</b> <i>file</i>,
<b>--file</b> <i>file</i></p>
<p style="margin-left:17%;">Read archive from or write
archive to <i>file</i>.</p>
<p style="margin-top: 1em"><b>-f</b> <i>pattern</i></p>
<p style="margin-left:17%;">(i mode only) Ignore files that
match <i>pattern</i>.</p>
<p style="margin-top: 1em"><b>-H</b> <i>format</i>,
<b>--format</b> <i>format</i></p>
<p style="margin-left:17%;">(o mode only) Produce the
output archive in the specified format. Supported formats
include:</p>
<p style="margin-top: 1em"><i>cpio</i></p>
<p style="margin-left:28%; margin-top: 1em">Synonym for
<i>odc</i>.</p>
<p><i>newc</i></p>
<p style="margin-left:28%; margin-top: 1em">The SVR4
portable cpio format.</p>
<p><i>odc</i></p>
<p style="margin-left:28%; margin-top: 1em">The old POSIX.1
portable octet-oriented cpio format.</p>
<p><i>pax</i></p>
<p style="margin-left:28%; margin-top: 1em">The POSIX.1 pax
format, an extension of the ustar format.</p>
<p><i>ustar</i></p>
<p style="margin-left:28%; margin-top: 1em">The POSIX.1 tar
format.</p>
<p style="margin-left:17%; margin-top: 1em">The default
format is <i>odc</i>. See libarchive-formats(5) for more
complete information about the formats currently supported
by the underlying libarchive(3) library.</p>
<p style="margin-top: 1em"><b>-h</b>, <b>--help</b></p>
<p style="margin-left:17%;">Print usage information.</p>
<p style="margin-top: 1em"><b>-I</b> <i>file</i></p>
<p style="margin-left:17%;">Read archive from
<i>file</i>.</p>
<p style="margin-top: 1em"><b>-i</b>, <b>--extract</b></p>
<p style="margin-left:17%;">Input mode. See above for
description.</p>
<p style="margin-top: 1em"><b>--insecure</b></p>
<p style="margin-left:17%;">(i and p mode only) Disable
security checks during extraction or copying. This allows
extraction via symbolic links, absolute paths, and path
names containing &rsquo;..&rsquo; in the name.</p>
<p style="margin-top: 1em"><b>-J</b>, <b>--xz</b></p>
<p style="margin-left:17%;">(o mode only) Compress the file
with xz-compatible compression before writing it. In input
mode, this option is ignored; xz compression is recognized
automatically on input.</p>
<p style="margin-top: 1em"><b>-j</b></p>
<p style="margin-left:17%; margin-top: 1em">Synonym for
<b>-y</b>.</p>
<p style="margin-top: 1em"><b>-L</b></p>
<p style="margin-left:17%; margin-top: 1em">(o and p modes)
All symbolic links will be followed. Normally, symbolic
links are archived and copied as symbolic links. With this
option, the target of the link will be archived or copied
instead.</p>
<p style="margin-top: 1em"><b>-l</b>, <b>--link</b></p>
<p style="margin-left:17%;">(p mode only) Create links from
the target directory to the original files, instead of
copying.</p>
<p style="margin-top: 1em"><b>--lrzip</b></p>
<p style="margin-left:17%;">(o mode only) Compress the
resulting archive with lrzip(1). In input mode, this option
is ignored.</p>
<p style="margin-top: 1em"><b>--lz4</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the archive with lz4-compatible compression before
writing it. In input mode, this option is ignored; lz4
compression is recognized automatically on input.</p>
<p style="margin-top: 1em"><b>--zstd</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the archive with zstd-compatible compression before
writing it. In input mode, this option is ignored; zstd
compression is recognized automatically on input.</p>
<p style="margin-top: 1em"><b>--lzma</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the file with lzma-compatible compression before
writing it. In input mode, this option is ignored; lzma
compression is recognized automatically on input.</p>
<p style="margin-top: 1em"><b>--lzop</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the resulting archive with lzop(1). In input mode,
this option is ignored.</p>
<p style="margin-top: 1em"><b>--passphrase</b>
<i>passphrase</i></p>
<p style="margin-left:17%;">The <i>passphrase</i> is used
to extract or create an encrypted archive. Currently, zip is
only a format that <b>cpio</b> can handle encrypted
archives. You shouldn&rsquo;t use this option unless you
realize how insecure use of this option is.</p>
<p style="margin-top: 1em"><b>-m</b>,
<b>--preserve-modification-time</b></p>
<p style="margin-left:17%;">(i and p modes) Set file
modification time on created files to match those in the
source.</p>
<p style="margin-top: 1em"><b>-n</b>,
<b>--numeric-uid-gid</b></p>
<p style="margin-left:17%;">(i mode, only with <b>-t</b>)
Display numeric uid and gid. By default, <b>cpio</b>
displays the user and group names when they are provided in
the archive, or looks up the user and group names in the
system password database.</p>
<p style="margin-top: 1em"><b>--no-preserve-owner</b></p>
<p style="margin-left:17%;">(i mode only) Do not attempt to
restore file ownership. This is the default when run by
non-root users.</p>
<p style="margin-top: 1em"><b>-O</b> <i>file</i></p>
<p style="margin-left:17%;">Write archive to
<i>file</i>.</p>
<p style="margin-top: 1em"><b>-o</b>, <b>--create</b></p>
<p style="margin-left:17%;">Output mode. See above for
description.</p>
<p style="margin-top: 1em"><b>-p</b>,
<b>--pass-through</b></p>
<p style="margin-left:17%;">Pass-through mode. See above
for description.</p>
<p style="margin-top: 1em"><b>--preserve-owner</b></p>
<p style="margin-left:17%;">(i mode only) Restore file
ownership. This is the default when run by the root
user.</p>
<p style="margin-top: 1em"><b>--quiet</b></p>
<p style="margin-left:17%;">Suppress unnecessary
messages.</p>
<p style="margin-top: 1em"><b>-R</b> [ <br>
user][ <br>
:][ <br>
group], <b>--owner</b> [ <br>
user][ <br>
:][ <br>
group]</p>
<p style="margin-left:17%;">Set the owner and/or group on
files in the output. If group is specified with no user (for
example, <b>-R</b> <i>:wheel</i>) then the group will be set
but not the user. If the user is specified with a trailing
colon and no group (for example, <b>-R</b> <i>root:</i>)
then the group will be set to the user&rsquo;s default
group. If the user is specified with no trailing colon, then
the user will be set but not the group. In <b>-i</b> and
<b>-p</b> modes, this option can only be used by the
super-user. (For compatibility, a period can be used in
place of the colon.)</p>
<p style="margin-top: 1em"><b>-r</b></p>
<p style="margin-left:17%; margin-top: 1em">(All modes.)
Rename files interactively. For each file, a prompt is
written to <i>/dev/tty</i> containing the name of the file
and a line is read from <i>/dev/tty</i>. If the line read is
blank, the file is skipped. If the line contains a single
period, the file is processed normally. Otherwise, the line
is taken to be the new name of the file.</p>
<p style="margin-top: 1em"><b>-t</b>, <b>--list</b></p>
<p style="margin-left:17%;">(i mode only) List the contents
of the archive to stdout; do not restore the contents to
disk.</p>
<p style="margin-top: 1em"><b>-u</b>,
<b>--unconditional</b></p>
<p style="margin-left:17%;">(i and p modes) Unconditionally
overwrite existing files. Ordinarily, an older file will not
overwrite a newer file on disk.</p>
<p style="margin-top: 1em"><b>-V</b>, <b>--dot</b></p>
<p style="margin-left:17%;">Print a dot to stderr for each
file as it is processed. Superseded by <b>-v</b>.</p>
<p style="margin-top: 1em"><b>-v</b>, <b>--verbose</b></p>
<p style="margin-left:17%;">Print the name of each file to
stderr as it is processed. With <b>-t</b>, provide a
detailed listing of each file.</p>
<p style="margin-top: 1em"><b>--version</b></p>
<p style="margin-left:17%;">Print the program version
information and exit.</p>
<p style="margin-top: 1em"><b>-y</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the archive with bzip2-compatible compression
before writing it. In input mode, this option is ignored;
bzip2 compression is recognized automatically on input.</p>
<p style="margin-top: 1em"><b>-Z</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the archive with compress-compatible compression
before writing it. In input mode, this option is ignored;
compression is recognized automatically on input.</p>
<p style="margin-top: 1em"><b>-z</b></p>
<p style="margin-left:17%; margin-top: 1em">(o mode only)
Compress the archive with gzip-compatible compression before
writing it. In input mode, this option is ignored; gzip
compression is recognized automatically on input.</p>
<p style="margin-top: 1em"><b>EXIT STATUS</b></p>
<p style="margin-left:6%;">The <b>cpio</b> utility
exits&nbsp;0 on success, and&nbsp;&gt;0 if an error
occurs.</p>
<p style="margin-top: 1em"><b>ENVIRONMENT</b></p>
<p style="margin-left:6%;">The following environment
variables affect the execution of <b>cpio</b>:</p>
<p style="margin-top: 1em">LANG</p>
<p style="margin-left:21%; margin-top: 1em">The locale to
use. See environ(7) for more information.</p>
<p style="margin-top: 1em">TZ</p>
<p style="margin-left:21%; margin-top: 1em">The timezone to
use when displaying dates. See environ(7) for more
information.</p>
<p style="margin-top: 1em"><b>EXAMPLES</b></p>
<p style="margin-left:6%;">The <b>cpio</b> command is
traditionally used to copy file hierarchies in conjunction
with the find(1) command. The first example here simply
copies all files from <i>src</i> to <i>dest</i>:</p>
<p style="margin-left:14%;"><b>find</b> <i>src</i> |
<b>cpio -pmud</b> <i>dest</i></p>
<p style="margin-left:6%; margin-top: 1em">By carefully
selecting options to the find(1) command and combining it
with other standard utilities, it is possible to exercise
very fine control over which files are copied. This next
example copies files from <i>src</i> to <i>dest</i> that are
more than 2 days old and whose names match a particular
pattern:</p>
<p style="margin-left:14%;"><b>find</b> <i>src</i>
<b>-mtime</b> <i>+2</i> | <b>grep foo[bar]</b> | <b>cpio
-pdmu</b> <i>dest</i></p>
<p style="margin-left:6%; margin-top: 1em">This example
copies files from <i>src</i> to <i>dest</i> that are more
than 2 days old and which contain the word
&rsquo;&rsquo;</p>
<p>foobar &rsquo;&rsquo;:</p>
<p style="margin-left:14%;"><b>find</b> <i>src</i>
<b>-mtime</b> <i>+2</i> | <b>xargs grep -l foobar</b> |
<b>cpio -pdmu</b> <i>dest</i></p>
<p style="margin-top: 1em"><b>COMPATIBILITY</b></p>
<p style="margin-left:6%;">The mode options i, o, and p and
the options a, B, c, d, f, l, m, r, t, u, and v comply with
SUSv2.</p>
<p style="margin-left:6%; margin-top: 1em">The old POSIX.1
standard specified that only <b>-i</b>, <b>-o</b>, and
<b>-p</b> were interpreted as command-line options. Each
took a single argument of a list of modifier characters. For
example, the standard syntax allows <b>-imu</b> but does not
support <b>-miu</b> or <b>-i -m -u</b>, since <i>m</i> and
<i>u</i> are only modifiers to <b>-i</b>, they are not
command-line options in their own right. The syntax
supported by this implementation is backwards-compatible
with the standard. For best compatibility, scripts should
limit themselves to the standard syntax.</p>
<p style="margin-top: 1em"><b>SEE ALSO</b></p>
<p style="margin-left:6%;">bzip2(1), gzip(1), mt(1),
pax(1), tar(1), libarchive(3), cpio(5),
libarchive-formats(5), tar(5)</p>
<p style="margin-top: 1em"><b>STANDARDS</b></p>
<p style="margin-left:6%;">There is no current POSIX
standard for the cpio command; it appeared in ISO/IEC
9945-1:1996 (&rsquo;&rsquo;POSIX.1&rsquo;&rsquo;) but was
dropped from IEEE Std 1003.1-2001
(&rsquo;&rsquo;POSIX.1&rsquo;&rsquo;).</p>
<p style="margin-left:6%; margin-top: 1em">The cpio, ustar,
and pax interchange file formats are defined by IEEE Std
1003.1-2001 (&rsquo;&rsquo;POSIX.1&rsquo;&rsquo;) for the
pax command.</p>
<p style="margin-top: 1em"><b>HISTORY</b></p>
<p style="margin-left:6%;">The original <b>cpio</b> and
<b>find</b> utilities were written by Dick Haight while
working in AT&amp;T&rsquo;s Unix Support Group. They first
appeared in 1977 in PWB/UNIX 1.0, the
&rsquo;&rsquo;Programmer&rsquo;s Work Bench&rsquo;&rsquo;
system developed for use within AT&amp;T. They were first
released outside of AT&amp;T as part of System III Unix in
1981. As a result, <b>cpio</b> actually predates <b>tar</b>,
even though it was not well-known outside of AT&amp;T until
some time later.</p>
<p style="margin-left:6%; margin-top: 1em">This is a
complete re-implementation based on the libarchive(3)
library.</p>
<p style="margin-top: 1em"><b>BUGS</b></p>
<p style="margin-left:6%;">The cpio archive format has
several basic limitations: It does not store user and group
names, only numbers. As a result, it cannot be reliably used
to transfer files between systems with dissimilar user and
group numbering. Older cpio formats limit the user and group
numbers to 16 or 18 bits, which is insufficient for modern
systems. The cpio archive formats cannot support files over
4 gigabytes, except for the &rsquo;&rsquo;odc&rsquo;&rsquo;
variant, which can support files up to 8 gigabytes.</p>
<p style="margin-left:6%; margin-top: 1em">BSD
September&nbsp;16, 2014 BSD</p>
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