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add ssh commands to 'System'

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bonnie 2019-11-04 00:08:19 +08:00
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README.md
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@ -1270,6 +1270,26 @@ xcowsay
## System
[[back to top](#handy-bash-one-liners)]
##### Generate public key from private key
```bash
ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub
```
##### Copy your default public key to remote user
```bash
ssh-copy-id <user_name>@<server_IP>
# then you need to enter the password
# and next time you won't need to enter password when ssh to that user
```
##### Copy default public key to remote user using the required private key (e.g. use your mykey.pem key to copy your id_rsa.pub to the remote user)
```bash
# before you need to use mykey.pem to ssh to remote user.
ssh-copy-id -i ~/.ssh/id_rsa.pub -o "IdentityFile ~/Downloads/mykey.pem" <user_name>@<server_IP>
# now you don't need to use key to ssh to that user.
```
##### Follow the most recent logs from service
```bash
journalctl -u <service_name> -f