README  |  2 +-
 main.go | 15 ++++++---------

diff --git a/README b/README
index f8b2b8a7b0eafc769c8e661a228126600c99e42f..56beec94e99a44c33ef68a54f9e3b1461720471b 100644
--- a/README
+++ b/README
@@ -68,7 +68,7 @@ TWO PASS MODE
 =============
 
 $ sgodup -basedir DIR -dupdir DIR -action ns [-minsize NNN] [-chmod NNN] > state
-$ sgodup -action ACTION [-fsync] -ns state
+$ sgodup -action ACTION [-fsync] -ns < state
 
 If you are dealing with huge amount of small files, then simultaneous
 reading (duplicate detection) and writing (duplicate files linking) on
diff --git a/main.go b/main.go
index 9c5382ce03f79d536422e03e383a7c403cfe6faa..e9fcf7ea1a1e50906f976b3c7fbfe55b53e519e2 100644
--- a/main.go
+++ b/main.go
@@ -39,7 +39,7 @@ 	"golang.org/x/crypto/blake2b"
 )
 
 const (
-	Version    = "0.1.0"
+	Version    = "0.2.0"
 	SectorSize = 1 << 12 // 4 KiB sector size
 	BufSize    = 1 << 17 // ZFS default 128 KiB recordsize
 
@@ -63,7 +63,7 @@ 	dupDir   = flag.String("dupdir", "", "Directory with possible duplicates")
 	actionS  = flag.String("action", "", "print, ns, symlink, hardlink")
 	minSize  = flag.Int64("minsize", 1, "minimal file size")
 	chmod    = flag.String("chmod", "", "chmod files")
-	nsPath   = flag.String("ns", "", "link targets from netstring file")
+	doNS     = flag.Bool("ns", false, "link targets from netstring read from stdin")
 	fsync    = flag.Bool("fsync", false, "fsync directories?")
 	version  = flag.Bool("version", false, "Print version information")
 	warranty = flag.Bool("warranty", false, "Print warranty information")
@@ -142,7 +142,7 @@   %s -basedir DIR -dupdir DIR -action {print,ns,symlink,hardlink}
     [-chmod XXX] [-minsize XXX] [-fsync]
 Two pass mode:
   %s -basedir DIR -dupdir DIR -action ns [-chmod XXX] [-minsize XXX] > state
-  %s -action {print,symlink,hardlink} [-fsync] -ns state
+  %s -action {print,symlink,hardlink} [-fsync] -ns < state
 
 Options:
 `, os.Args[0], os.Args[0], os.Args[0])
@@ -184,17 +184,14 @@ 	default:
 		log.Fatalln("invalid action")
 	}
 
-	if *nsPath != "" {
+	if *doNS {
 		if action == ActNS {
 			log.Fatalln("\"-action ns\" has no meaning with -ns")
 		}
-		fd, err := os.Open(*nsPath)
-		if err != nil {
-			log.Fatal(err)
-		}
-		nsR := netstring.NewReader(bufio.NewReaderSize(fd, BufSize))
+		nsR := netstring.NewReader(bufio.NewReaderSize(os.Stdin, BufSize))
 		pathDup := make([]byte, 1<<10)
 		pathOrig := make([]byte, 1<<10)
+		var err error
 		var pathDupLen, pathOrigLen uint64
 		files := 0
 		fullSize := int64(0)