Update cheatsheets

ect

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ect
+
+> Efficient Compression Tool.
+> File optimizer written in C++. It supports `.png`, `.jpg`, `.gzip` and `.zip` files.
+> More information: <https://github.com/fhanau/Efficient-Compression-Tool>.
+
+- Compress a file:
+
+`ect {{path/to/file.png}}`
+
+- Compress a file with specified compression level and multithreading (1=Fastest (Worst), 9=Slowest (Best), default is 3):
+
+`ect -{{9}} --mt-deflate {{path/to/file.zip}}`
+
+- Compress all files in a directory recursively:
+
+`ect -recurse {{path/to/directory}}`
+
+- Compress a file, keeping the original modification time:
+
+`ect -keep {{path/to/file.png}}`
+
+- Compress a file, stripping metadata:
+
+`ect -strip {{path/to/file.png}}`