BashConfig
## Content
* [Project description](#chapter-0)
* [SSH](#chapter-1)
* [Tips](#chapter-2)
## Project description
Bash config files
[]()
## SSH
Create ssh key on local device
1. `ssh-keygen`
2. Save to `~/.ssh`
3. Enter passphrase
4. Copy content of `~/.ssh/id_rsa.pub` key to remote `~/.ssh/authorized_keys`
\
Add aliases for ssh to `~/.ssh/config`:
```
Host host_name
HostName ip
Port 22
User root
IdentityFile ~/.ssh/id_rsa
```
\
Using aliases:
```bash
ssh host_name
sftp host_name
```
### White and black lists
add white list to ```/etc/hosts.allow```:
```text
sshd: 10.83.33.77/32, 10.63.152.9/32, 10.12.100.11/28, 10.82.192.0/28
```
add black list to ```/etc/hosts.deny```:
```text
sshd: ALL
```
## Tips
### Bash
| Command | Description |
|:------------------: | :------------------ |
|```Alt + . ``` ```Esc + .``` | Last object |
|```Ctrl + r``` | Search by bash_history |
|```Ctrl + l``` | Clear, like command clear |
```bash
ssh hosting 'rm -rf ~/BashConfig; git clone https://github.com/TheK4n/BashConfig && cp BashConfig/.bash* ~; rm -rf ~/BashConfig'
```
```$RANDOM``` - Return random 0-32767\
```/command``` - Without using alias\
```df -h /``` - Size
### Vim
| Command | Description |
|:------------------: | :------------------------------------ |
|```Ctrl + [``` | Analog Esc |
|```d -> Ctrl + End``` | Delete from cursor to end of file |
| ```u``` | Undo |
| ```Ctrl + r``` | Redo |
| ```22G``` | Go to line 22 |
### Autostart
* create ```/etc/systemd/system/.service```
```bash
sudo vim /etc/systemd/system/.service
sudo systemctl daemon-reload
sudo systemctl start .service
sudo systemctl status .service
sudo systemctl enable .service
```
### Cron
```crontab -e```
```0 0 1 1 * command.sh``` - Every year in 1 January 00:00:00 \
```*/1 * * * * command.sh``` - Every minute\
```0 */3 * * 2,5 command.sh``` - One time per 3 hours in Tue and Fri\
```0 0,12 1 */2 * command.sh``` - At minute 0 past hour 0 and 12 on day-of-month 1 in every 2nd month