Index: uspace/app/bdsh/cmds/modules/cp/cp.c
===================================================================
--- uspace/app/bdsh/cmds/modules/cp/cp.c	(revision afe1d1e203e5c589222f7579368f84a24d325f3c)
+++ uspace/app/bdsh/cmds/modules/cp/cp.c	(revision 5f9f37da1ef3baca02cafd4410aad63c305e3e41)
@@ -108,4 +108,5 @@
 	for (;;) {
 		ssize_t res;
+		size_t written = 0;
 
 		bytes = read(fd1, buff, blen);
@@ -120,7 +121,8 @@
 			 * returned less data than requested.
 			 */
-			bytes = write(fd2, buff, res);
+			bytes = write(fd2, buff + written, res);
 			if (bytes < 0)
 				goto err;
+			written += bytes;
 			res -= bytes;
 		} while (res > 0);