path: root/doc/cpio.1
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Diffstat (limited to 'doc/cpio.1')
1 files changed, 9 insertions, 1 deletions
diff --git a/doc/cpio.1 b/doc/cpio.1
index 53f9395..d48d2df 100644
--- a/doc/cpio.1
+++ b/doc/cpio.1
@@ -13,7 +13,7 @@
.\" You should have received a copy of the GNU General Public License
.\" along with GNU cpio. If not, see <http://www.gnu.org/licenses/>.
-.TH CPIO 1 "January 29, 2014" "CPIO" "GNU CPIO"
+.TH CPIO 1 "January 30, 2014" "CPIO" "GNU CPIO"
cpio \- copy files to and from archives
@@ -182,6 +182,14 @@ files differently).
In copy-in and copy-pass mode, set the ownership of all files created
to the specified \fIUSER\fR and/or \fIGROUP\fR. In copy-out mode,
store the supplied owner information in the archive.
+\fIUSER\fR and \fIGROUP\fR are first looked up in the system user and
+group databases. If not found, \fBcpio\fR checks if they consist of
+decimal digits only and, if so, treats them as numeric UID and GID,
+To avoid the lookup and ensure that arguments are treated as numeric
+values, prefix them with a plus sign, e.g.: \fB-R +0:+0\fR.
.B \-\-quiet
Do not print the number of blocks copied at the end of the run.

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