Time to note down some SSH tricks. Vim, Git, Unix, SSH! All very efficient when you spend some time learning the ins and outs.
The power of ~/.ssh/config
Man. Check out this nice intro. Using this file is more convenient than shell aliases. I even used this file to solve a mysterious "Too many authentication failures for [user]" which happened (ssh -v) when multiple keys were offered to the remote host!
Run ssh -X host to show remote X applications on your local screen (if X is running on your local machine)
Run commands on a remote server
ssh user@remote_host 'cmd' - this is a powerful way to quickly analyze data on different hosts without the burden of logging in and copying terminal output. See a nice Perl loop example.
Pipe data from/to a remote system
One of my favorites: see this post for two powerful examples:
- 1. send a big directory to a another server compressing / uncompressing it via the pipe-to-ssh:
- 2. backup a remote mysql database to STDOUT and receive it via pipe/SSH as STDIN to import it into a local DB:
$ tar -cz content | ssh user@remote_host 'tar -xz'
The other way around works just as well to get files off a remote server: $ ssh remote_host tar c content/ | tar xv
$ ssh user@remote_host 'mysqldump -udbuser -ppassword dbname' | mysql -uroot -ppassword backup
Mount a remote directory
$ sshfs user@remote_host:/home/user/documents local_folder/ - see this ssh hacks post.
This just happened trying to convert this post from text to html:
$ perl parsepost.pl 2013.05.12_ssh_tricks.txt Can't locate HTML/Entities.pm in @INC ...
Instead of fixing it right away I took the opportunity to try a quick workaround via ssh:
# cat the txt post to STDOUT, # via pipe/ssh to remote server it goes into perl script as STDIN (-), # the result is redirected to a file on my local server, # note that I can do "ssh bob" thanks to my .ssh/config setup ;) $ cat 2013.05.12_ssh_tricks.txt | ssh bob <path>/perl/wordpress_parse_post.pl - > 2013.05.12_ssh_tricks.html
Only the beginning
Forwarding, tunneling, proxies, access to services through a firewall ... much more is possible. Check out SSH: More than secure shell for other SSH use cases.
Your favorite SSH trick/ hack?
Feel free to comment below ...
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