Lightweight Java clone of the netcat tool.
You need Java (JRE) version 8 or later to run jnetcat.
- Install the jnetcat package (.deb, .rpm or .jar) from releases or compile from source.
- Run /opt/jnetcat/bin/jnetcat, if installed from package, or as java -jar /path/to/jnetcat.jar
Usage: jnetcat [-hV] [-b=NUM] [-p=NUM] (-c=SRV | -s)
For more information visit https://github.com/mnellemann/jnetcat
-b, --buffer=NUM Buffer size in kB [default: 128].
-c, --connect=SRV Connect to remote server (client).
-h, --help Show this help message and exit.
-p, --port=NUM Network port [default: 4445].
-s, --server Run server and wait for client (server).
-V, --version Print version information and exit.On host A run jnetcat as a server (receiver) waiting for a connection from a client and writing data to stdout:
java -jar jnetcat-x.y.z-all.jar -s > output.fileOn host B run jnetcat as a client (sender) connecting to the server and reading data from stdin:
java -jar jnetcat-x.y.z-all.jar -c server-ip < input.fileExample from 1Gb network
On the sender host:
$ dd if=/dev/urandom of=/tmp/test-5g.file bs=1000000 count=5000
$ md5sum /tmp/test-5g.file
1a967529d848d97e425099743ab52000 /tmp/test-5g.file
$ /opt/jnetcat/bin/jnetcat -c reciving-host < /tmp/test-5g.file
2024-06-26 10:21:28 - Status: 119013376 B/s 119013 KB/s 119 MB/s
2024-06-26 10:21:29 - Status: 118095872 B/s 118095 KB/s 118 MB/s
2024-06-26 10:21:30 - Status: 118226944 B/s 118226 KB/s 118 MB/s
2024-06-26 10:21:31 - Status: 117833728 B/s 117833 KB/s 117 MB/s
2024-06-26 10:21:32 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:21:33 - Status: 118358016 B/s 118358 KB/s 118 MB/s
2024-06-26 10:21:34 - Status: 119013376 B/s 119013 KB/s 119 MB/s
2024-06-26 10:21:35 - Status: 117833728 B/s 117833 KB/s 117 MB/s
2024-06-26 10:21:36 - Status: 118226944 B/s 118226 KB/s 118 MB/s
2024-06-26 10:21:37 - Status: 118358016 B/s 118358 KB/s 118 MB/s
2024-06-26 10:21:38 - Status: 118489088 B/s 118489 KB/s 118 MB/s
2024-06-26 10:21:39 - Status: 118489088 B/s 118489 KB/s 118 MB/s
2024-06-26 10:21:40 - Status: 118489088 B/s 118489 KB/s 118 MB/s
2024-06-26 10:21:41 - Status: 118489088 B/s 118489 KB/s 118 MB/s
2024-06-26 10:21:42 - Status: 118095872 B/s 118095 KB/s 118 MB/s
2024-06-26 10:21:43 - Status: 118620160 B/s 118620 KB/s 118 MB/s
2024-06-26 10:21:44 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:21:45 - Status: 119144448 B/s 119144 KB/s 119 MB/s
2024-06-26 10:21:48 - Status: 25821184 B/s 25821 KB/s 25 MB/s
2024-06-26 10:21:52 - Status: 7995392 B/s 7995 KB/s 7 MB/s
2024-06-26 10:21:53 - Status: 108527616 B/s 108527 KB/s 108 MB/s
2024-06-26 10:21:54 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:21:55 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:21:56 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:21:57 - Status: 117964800 B/s 117964 KB/s 117 MB/s
2024-06-26 10:21:58 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:21:59 - Status: 119144448 B/s 119144 KB/s 119 MB/s
2024-06-26 10:22:00 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:22:01 - Status: 104857600 B/s 104857 KB/s 104 MB/s
2024-06-26 10:22:02 - Status: 117571584 B/s 117571 KB/s 117 MB/s
2024-06-26 10:22:02 - Average: 110685934 B/s 110685 KB/s 110 MB/s 0.11 GB/s
2024-06-26 10:22:03 - Status: 119144448 B/s 119144 KB/s 119 MB/s
2024-06-26 10:22:04 - Status: 117833728 B/s 117833 KB/s 117 MB/s
2024-06-26 10:22:05 - Status: 117702656 B/s 117702 KB/s 117 MB/s
2024-06-26 10:22:06 - Status: 117833728 B/s 117833 KB/s 117 MB/s
2024-06-26 10:22:07 - Status: 117833728 B/s 117833 KB/s 117 MB/s
2024-06-26 10:22:08 - Status: 117964800 B/s 117964 KB/s 117 MB/s
2024-06-26 10:22:09 - Status: 117964800 B/s 117964 KB/s 117 MB/s
2024-06-26 10:22:10 - Status: 117964800 B/s 117964 KB/s 117 MB/s
2024-06-26 10:22:11 - Status: 119013376 B/s 119013 KB/s 119 MB/s
2024-06-26 10:22:12 - Status: 119013376 B/s 119013 KB/s 119 MB/s
2024-06-26 10:22:13 - Status: 117964800 B/s 117964 KB/s 117 MB/s
2024-06-26 10:22:14 - Status: 117833728 B/s 117833 KB/s 117 MB/s
2024-06-26 10:22:15 - Status: 117964800 B/s 117964 KB/s 117 MB/s
2024-06-26 10:22:16 - Status: 118489088 B/s 118489 KB/s 118 MB/s
2024-06-26 10:22:17 - Summary: 5000000000 B 5000000 KB 5000 MB 5.00 GB
On the receiving host:
$ /opt/jnetcat/bin/jnetcat -s > /tmp/jnetcat.out
2024-06-26 10:21:27 - Status: 0 B/s 0 KB/s 0 MB/s
2024-06-26 10:21:28 - Status: 117331440 B/s 117331 KB/s 117 MB/s
2024-06-26 10:21:29 - Status: 117722400 B/s 117722 KB/s 117 MB/s
2024-06-26 10:21:30 - Status: 117697784 B/s 117697 KB/s 117 MB/s
2024-06-26 10:21:31 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:32 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:21:33 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:34 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:35 - Status: 117725296 B/s 117725 KB/s 117 MB/s
2024-06-26 10:21:36 - Status: 117694888 B/s 117694 KB/s 117 MB/s
2024-06-26 10:21:37 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:38 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:21:39 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:40 - Status: 117720952 B/s 117720 KB/s 117 MB/s
2024-06-26 10:21:41 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:42 - Status: 117689096 B/s 117689 KB/s 117 MB/s
2024-06-26 10:21:43 - Status: 117689096 B/s 117689 KB/s 117 MB/s
2024-06-26 10:21:44 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:45 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:21:48 - Status: 30938088 B/s 30938 KB/s 30 MB/s
2024-06-26 10:21:52 - Status: 8126464 B/s 8126 KB/s 8 MB/s
2024-06-26 10:21:53 - Status: 111062640 B/s 111062 KB/s 111 MB/s
2024-06-26 10:21:54 - Status: 117732536 B/s 117732 KB/s 117 MB/s
2024-06-26 10:21:55 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:21:56 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:57 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:21:58 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:21:59 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:00 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:01 - Status: 103420504 B/s 103420 KB/s 103 MB/s
2024-06-26 10:22:01 - Average: 110201737 B/s 110201 KB/s 110 MB/s 0.11 GB/s
2024-06-26 10:22:02 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:03 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:04 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:05 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:22:06 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:07 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:08 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:22:09 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:10 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:11 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:22:12 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:22:13 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:14 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:22:15 - Status: 117741224 B/s 117741 KB/s 117 MB/s
2024-06-26 10:22:16 - Status: 117678960 B/s 117678 KB/s 117 MB/s
2024-06-26 10:22:17 - Summary: 5000000000 B 5000000 KB 5000 MB 5.00 GB
$ md5sum /tmp/jnetcat.out
1a967529d848d97e425099743ab52000 /tmp/jnetcat.out