Update cheatsheets

sdiff

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sdiff
+
+> Compare the differences between and optionally merge 2 files.
+> More information: <https://manned.org/sdiff>.
+
+- Compare 2 files:
+
+`sdiff {{path/to/file1}} {{path/to/file2}}`
+
+- Compare 2 files, ignoring all tabs and whitespace:
+
+`sdiff -W {{path/to/file1}} {{path/to/file2}}`
+
+- Compare 2 files, ignoring whitespace at the end of lines:
+
+`sdiff -Z {{path/to/file1}} {{path/to/file2}}`
+
+- Compare 2 files in a case-insensitive manner:
+
+`sdiff -i {{path/to/file1}} {{path/to/file2}}`
+
+- Compare and then merge, writing the output to a new file:
+
+`sdiff -o {{path/to/merged_file}} {{path/to/file1}} {{path/to/file2}}`