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technology/applications/cli/diff.md

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+---
+obj: application
+wiki: https://en.wikipedia.org/wiki/Diff
+website: https://www.gnu.org/software/diffutils/
+repo: https://git.savannah.gnu.org/cgit/diffutils.git
+---
+# diff
+compare files line by line
+Usage: `diff [OPTION]... FILES`
+
+## Options
+| Option                         | Description                                     |
+| ------------------------------ | ----------------------------------------------- |
+| `--normal`                     | output a normal diff (the default)              |
+| `-q, --brief`                  | report only when files differ                   |
+| `-s, --report-identical-files` | report when two files are the same              |
+| `-c, -C NUM, --context[=NUM]`  | output NUM (default 3) lines of copied context  |
+| `-u, -U NUM, --unified[=NUM]`  | output NUM (default 3) lines of unified context |
+| `-r, --recursive`              | recursively compare any subdirectories found    |
+| `-a, --text`                   | treat all files as text                         |