Commands tagged ssh

Mac install ssh-copy-id

From there on out, you would upload keys to a server like this:

(make sure to double quote the full path to your key)

or, if your SSH server uses a different port (often, they will require that the port be '2222' or some other nonsense:

(note the double quotes on *both* the "/path/to/key" and "user@server -pXXXX"):

...where XXXX is the ssh port on that server

this command from the source server and this follow in the destination server:

ssh user@localhost -p 8888

commandline for mac os x

Works for multiple hosts (such as www.google.com) and/or wrong hosts.

Quick shortcut if you know the hostname and want to save yourself one step for looking up the IP address separately.

Easily removes line #2 in ~/.ssh/known_hosts.

If you have servers on Wide Area Network (WAN), you may experience very long transfer rates due to limited bandwidth and latency.

To speed up you transfers you need to compress the data so you will have less to transfer.

So the solution is to use a compression tools like gzip or bzip or compress before and after the data transfer.

Using ssh "-C" option is not compatible with every ssh version (ssh2 for instance).

It's useful mostly for your custom scripts, which running on specific host and tired on ssh'ing every time when you need one simple command (i use it for update remote apt repository, when new package have to be downloaded from another host).

Don't forget to set up authorization by keys, for maximum comfort.

This improves on #9892 by compressing the directory on the remote machine so that the amount of data transferred over the network is much smaller. The command uses ssh(1) to get to a remote host, uses tar(1) to archive and compress a remote directory, prints the result to STDOUT, which is written to a local file. In other words, we are archiving and compressing a remote directory to our local box.

The command uses ssh(1) to get to a remote host, uses tar(1) to archive a remote directory, prints the result to STDOUT, which is piped to gzip(1) to compress to a local file. In other words, we are archiving and compressing a remote directory to our local box.

If you work in an environment, where some ssh hosts change regularly this might be handy...

This command shows a sorted list of the IP addresses from which there have been authentication errors via SSH (possible script kiddies trying to gain access to your server), it eliminates duplicates so it's easier to read, but you can remove the "uniq" command at the end, or even do a "uniq -c" to have a count of how many times each IP address shows in the log (the path to the log may vary from system to system)

Transfer files with rsync over ssh on a non-standard port, showing a progress bar and resuming partial transfers.

this way you have the multitail with all its options running on your own machine with the tails of the two remote machines inside :)

Listens on local port 5500 and connects to remotehost with username user to tunnel the given socket file. Will work with anything, but can be useful if there's a need for a local application to connect with a remote server which was started without networking.

Creates the .ssh directory on the remote host with proper permissions, if it doesnt exist. Appends your public key to authorized_keys, and verifies it has proper permissions. (if it didnt exist it may have been created with undesireable permissions).

*Korn shell syntax, may or may not work with bash

This one is a bit more robust -- the remote machine may not have an .ssh directory, and it may not have an authorized_keys file, but if it does already, and you want to replace your ssh public key for some reason, this will work in that case as well, without duplicating the entry.

analyze traffic remotely over ssh w/ wireshark

When using tcpdump, specify -U option to prevent buffering and -iany to see all interfaces.

Create a secure tunnelled connection for access to a remote MySQL database.

For example, connect with MySQL Workbench to root@127.0.0.1:13306.

Neat idea! This variation works on FreeBSD.

Shorter, easier to remember version of cmd#7636

NTP is better, but there are situations where it can't be used. In those cases, you can do this to sync the local time to a server.

If you have a lot of hosts in /etc/hosts this would be very useful. Anyone have any more concise examples?

SSH can be controlled trough an ~ escape sequence. Example, to terminate the current ssh connection, type a newline, then the ~ character, and last a . character.

This is useful eg when an ssh connection hangs after you reboot a machine and the connection hangs.