Add some TILs

Author: Mopolo

resources/data/til/bash/file-update-date.md

@@ -0,0 +1,13 @@
+---
+category: Bash
+title: Change a file last update date
+---
+It can be useful to change a file last update date, which can be done with `touch`:
+
+```bash
+# To set a date in the past
+touch -d "10 minutes ago" ./example.txt
+
+# To set it to now
+touch ./example.txt
+```

resources/data/til/tips/find-ip.md resources/data/til/bash/find-ip.mdresources/data/til/tips/find-ip.md renamed to resources/data/til/bash/find-ip.md

@@ -1,10 +1,11 @@
 ---
-category: Tips
+category: Bash
 title: Find a machine's IP public address
 sources:
     - https://ifconfig.me
 ---
 For this we can use `curl`:
+
 ```bash
 curl ifconfig.me/ip
 ```

resources/data/til/bash/generate-password.md

@@ -0,0 +1,25 @@
+---
+category: Bash
+title: Generate random passwords
+sources:
+    - https://github.com/tytso/pwgen
+    - https://doc.ubuntu-fr.org/pwgen
+---
+The `pwgen` command can be used to generate random passwords.
+
+Here's a breakdown of options:
+```bash
+pwgen  -s  -c  -y  -1  30   5
+        │   │   │   │   │   │
+        │   │   │   │   │   └─── Generate 5 passwords
+        │   │   │   │   │
+        │   │   │   │   └─── Each password is 30 characters long
+        │   │   │   │
+        │   │   │   └─── Print one password per line
+        │   │   │
+        │   │   └─── Include at least one special character
+        │   │
+        │   └─── Include at least one capital letter
+        │
+        └─── Generate secure, completely random passwords
+```