update to nextra 4

content/cli/convert-documents.md

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+# Convert documents
+
+```bash
+find . -name "*.odt" | xargs -I % pandoc % -o %.md
+```
+
+You can add the `-p` flag to `xargs` to confirm before executing, useful for testing if what your are doing is actually correct.

content/cli/delete-empty-directories.md

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+# Delete empty directories
+
+```bash
+find . -type d -empty -delete
+```
+
+This recursively finds and deletes empty directory.

content/cli/diff.md

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+# See difference between files / directories
+
+```bash
+diff -ry dir1 dir2
+```
+
+The `-r` flag is to recurse into folders. The `-y` flag creates a side by side view, generally easier to read. `-q` Would only show what filenames changed.

content/cli/format-drive.md

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+---
+tags:
+  - cli
+  - macos
+  - format
+---
+
+# Format a Drive
+
+## macOS
+
+Some times Disk Utility cannot format a whole drive for some reason.
+
+```
+# Check devices
+diskutil list
+
+# To exfat
+diskutil eraseDisk EXFAT "NAME" GPT /dev/diskN
+
+# To fat32, with mbr
+ diskutil eraseDisk FAT32 "NAME" MBR /dev/diskN
+```

content/cli/rename.md

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+---
+tags:
+  - rename
+  - regex
+---
+
+# `rename`
+
+`rename` is a command to rename based on regex.
+
+```bash
+rename 's/.odt.md/.md/' *.odt.md
+```
+
+> Use the `-n` flag to dry run