14-11-2023

docs/macos/terminal/reachable.md

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+# 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
+```
+