# Reachable

### ping

```bash
❯ ping -c1 -W1 -q maboiteverte.fr
PING maboiteverte.fr (212.227.191.167): 56 data bytes

--- maboiteverte.fr ping statistics ---
1 packets transmitted, 0 packets received, 100.0% packet loss

# immédiat

❯ echo $?
0
```

```bash
❯ ping -c1 -W1 -q clicclac.synology.me
PING clicclac.synology.me (192.168.2.7): 56 data bytes

--- clicclac.synology.me ping statistics ---
1 packets transmitted, 0 packets received, 100.0% packet loss

# immédiat

❯ echo $?
2
```



```bash
❯ ping -c1 -W1 -q google.fr
PING google.fr (216.58.213.67): 56 data bytes

--- google.fr ping statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 19.936/19.936/19.936/0.000 ms

❯ echo $?
0
```



### nmap

```bash
❯ nmap maboiteverte.fr -PN -p 22 | grep open
22/tcp open  ssh

# immédiat

❯ echo $?
0
```

```bash
❯ nmap clicclac.synology.me -PN -p 42666 | grep open

# 2s

❯ echo $?
1
```

```bash
if [ "$?" = 0 ]
then
  echo "Host found"
else
  echo "Host not found"
fi
```



# nc

```bash
❯ nc -z -G 2 maboiteverte.fr 22
Connection to maboiteverte.fr port 22 [tcp/ssh] succeeded!

# immédiat

❯ echo $?
0
```

```bash
❯ nc -z -G 2 clicclac.synology.me 42666

# 3s

❯ echo $?
1
```



# ssh

```bash
❯ &>/dev/null ssh bruno@maboiteverte.fr true && echo "up" || echo "down"
up

# 2s
```

```bash
❯ &>/dev/null ssh bruno@clicclac.synology.me true && echo "up" || echo "down"
down

# long 75s
```