Use genfile --files-from

tests/multiv04.at

@@ -39,7 +39,7 @@ AT_KEYWORDS([multivolume multiv incremental multiv04])
 AT_TAR_CHECK([
 
 mkdir directory
-awk 'BEGIN { for (i = 0; i < 1024; i++) printf("genfile -f directory/%014x\n", i); }' </dev/null | sh
+awk 'BEGIN { for (i = 0; i < 1024; i++) printf("directory/%014x\n", i); }' </dev/null | genfile --files-from -
 
 exec <&-