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Password-less authentication:
  • generate public and private key e.g. with ssh-keygen -a 100 -t ed25519 -C "a comment" -f name_of_the_file note: previously ssh-keygen -t rsa -b 4096 -C "a comment"
  • on the machine from which you connect: put private key in ~/.ssh/id_rsa (for rss key) or ~/.ssh/id_dsa (for dsa key), with 0600 permissions
  • on the machine you connect to: append public key to ~/.ssh/authorized_keys (also with 0600 permission)
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Using a different username with svn+ssh:
By default ssh uses $USER when connecting to a server. This makes things difficult if you use svn with ssh authentication and your username for svn server is different than $USER. To get around this define per host SSH settings. To do this, edit ~/.ssh/config and add the lines:
Host svn.yourserver.com
User jdoe
That instructs ssh to use the username jdoe instead of your unix username when connecting to svn.youserver.com. If you use password-protected ssh keys, you will be prompted for a private key password, like this:
Enter passphrase for key '/home/jdoe/.ssh/id_dsa':
To get around this you can either setup ssh-agent to cache this password or you can turn off the password on your private key. To do the latter: ssh-keygen -t dsa -p and when it prompts for a new passphrase, just hit enter.
Using ssh agent:
Ssh agent remembers password for your private key, so you only have to type it once in a session, not every time it’s used.
Start ssh agent: ssh-agent Add keys: ssh-add List currently loaded keys: ssh-add -l
Cygwin and ssh agent:
Add this to ~/.bashrc:
## Enable ssh agent
export SSH_AUTH_SOCK=/tmp/.ssh-socket

ssh-add -l \>/dev/null 2\>&1

if [ $? = 2 ]; then
 # Exit status 2 means couldn’t connect to ssh-agent; start one now
 rm -rf /tmp/.ssh*
 ssh-agent -a $SSH_AUTH_SOCK >/tmp/.ssh-script
 . /tmp/.ssh-script
 echo $SSH_AGENT_PID >/tmp/.ssh-agent-pid

function kill-agent {
 pid=`cat /tmp/.ssh-agent-pid`
 kill $pid

function addkeys {
 ssh-add ~/.ssh/id_dsa*
Set an alias for a hostname
In ~/.ssh/config:
Host dev30
    HostName dev30.kowalczyk.info
    User root
    IdentityFile ~/.ssh/id_dsa_dev30

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