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+nix [OPTIONS...] [ARGUMENTS...]
+
+Operations:
+
+  --install / -i: realise a Nix expression
+  --delete / -d: delete paths from the Nix store
+  --add / -A: copy a path to the Nix store
+  --query / -q: query information
+
+  --successor: register a successor expression
+  --substitute: register a substitute expression
+
+  --dump: dump a path as a Nix archive
+  --restore: restore a path from a Nix archive
+
+  --init: initialise the Nix database
+  --verify: verify Nix structures
+
+  --version: output version information
+  --help: display help
+
+Query flags:
+
+  --list / -l: query the output paths (roots) of a Nix expression (default)
+  --requisites / -r: print all paths necessary to realise expression
+  --predecessors: print predecessors of a Nix expression
+  --graph: print a dot graph rooted at given ids
+
+Options:
+
+  --verbose / -v: verbose operation (may be repeated)
+  --keep-failed / -K: keep temporary directories of failed builds