diff --git a/infer/src/base/CommandLineOption.ml b/infer/src/base/CommandLineOption.ml
index 4eb79cde5..de5625917 100644
--- a/infer/src/base/CommandLineOption.ml
+++ b/infer/src/base/CommandLineOption.ml
@@ -282,7 +282,7 @@ let deprecate_desc parse_mode ~long ~short ~deprecated desc =
     spec = deprecated_spec; decode_json = deprecated_decode_json }
 
 let mk ?(deprecated=[]) ?(parse_mode=Infer [])
-    ~long ?(short="") ~default ~meta doc ~default_to_string ~decode_json ~mk_setter ~mk_spec =
+    ~long ?short:short0 ~default ~meta doc ~default_to_string ~decode_json ~mk_setter ~mk_spec =
   let variable = ref default in
   let closure = mk_setter variable in
   let setter str =
@@ -295,7 +295,8 @@ let mk ?(deprecated=[]) ?(parse_mode=Infer [])
     let default_string = default_to_string default in
     if default_string = "" then doc
     else doc ^ " (default: " ^ default_string ^ ")" in
-  let desc = {long; short; meta; doc; spec; decode_json} in
+  let short = match short0 with Some c -> String.of_char c | None -> "" in
+  let desc = {long; short=short; meta; doc; spec; decode_json} in
   (* add desc for long option, with documentation (which includes any short option) for exes *)
   if long <> "" then add parse_mode desc ;
   (* add desc for short option only for parsing, without documentation *)
@@ -306,7 +307,7 @@ let mk ?(deprecated=[]) ?(parse_mode=Infer [])
     add parse_mode_no_sections {desc with long = ""; meta = ""; doc = ""} ;
   (* add desc for deprecated options only for parsing, without documentation *)
   List.iter deprecated ~f:(fun deprecated ->
-      deprecate_desc parse_mode ~long ~short ~deprecated desc
+      deprecate_desc parse_mode ~long ~short:short ~deprecated desc
       |> add parse_mode_no_sections) ;
   variable
 
@@ -338,7 +339,7 @@ let final_parse_action = ref (Infer Driver)
 (* end parsing state *)
 
 type 'a t =
-  ?deprecated:string list -> long:Arg.key -> ?short:Arg.key ->
+  ?deprecated:string list -> long:Arg.key -> ?short:char ->
   ?parse_mode:parse_mode -> ?meta:string -> Arg.doc ->
   'a
 
@@ -373,23 +374,20 @@ let mk_bool ?(deprecated_no=[]) ?(default=false) ?(f=fun b -> b)
       "no-" ^ long
   and noshort =
     Option.map ~f:(fun short ->
-        let len = String.length short in
-        if len > 1 && String.sub short ~pos:0 ~len:1 = "n" then
-          String.sub short ~pos:1 ~len:(len - 1)
-        else
-          "n" ^ short
+        if Char.is_lowercase short then Char.uppercase short
+        else Char.lowercase short
       ) short
   in
-  let doc nolong =
-    match noshort with
-    | Some noshort -> doc ^ " (Conversely: --" ^ nolong ^ " | -" ^ noshort ^ ")"
-    | None         -> doc ^ " (Conversely: --" ^ nolong ^ ")"
+  let doc long short =
+    match short with
+    | Some short -> doc ^ " (Conversely: --" ^ long ^ " | -" ^ String.of_char short ^ ")"
+    | None       -> doc ^ " (Conversely: --" ^ long ^ ")"
   in
   let doc, nodoc =
     if not default then
-      ("Activates: " ^ doc nolong, "")
+      ("Activates: " ^ doc nolong noshort, "")
     else
-      ("", "Deactivates: " ^ doc long) in
+      ("", "Deactivates: " ^ doc long short) in
   let default_to_string _ = "" in
   let mk_spec set = Unit (fun () -> set "") in
   let var =
diff --git a/infer/src/base/CommandLineOption.mli b/infer/src/base/CommandLineOption.mli
index 250722718..2040905c3 100644
--- a/infer/src/base/CommandLineOption.mli
+++ b/infer/src/base/CommandLineOption.mli
@@ -47,7 +47,7 @@ val init_work_dir : string
     - a documentation string
 *)
 type 'a t =
-  ?deprecated:string list -> long:string -> ?short:string ->
+  ?deprecated:string list -> long:string -> ?short:char ->
   ?parse_mode:parse_mode -> ?meta:string -> string ->
   'a
 
@@ -59,8 +59,8 @@ val mk_option :
   'a option ref t
 
 (** [mk_bool long short doc] defines a [bool ref] set by the command line flag [--long] (and
-    [-short]), and cleared by the flag [--no-long] (and [-nshort]).  If [long] already has a "no-",
-    or [short] nas an "n", prefix, then the existing prefixes will instead be removed. The default
+    [-s]), and cleared by the flag [--no-long] (and [-S]).  If [long] already has a "no-" prefix,
+    or [s] is capital, then the existing prefixes will instead be removed. The default
     value is [false] unless overridden by [~default:true].  The [doc] string will be prefixed with
     either "Activates:" or "Deactivates:", so should be phrased accordingly. *)
 val mk_bool : ?deprecated_no:string list ->  ?default:bool -> ?f:(bool -> bool) -> bool ref t
diff --git a/infer/src/base/Config.ml b/infer/src/base/Config.ml
index d3d6fa90d..604fce5cc 100644
--- a/infer/src/base/Config.ml
+++ b/infer/src/base/Config.ml
@@ -384,7 +384,7 @@ let inferconfig_home =
     ~parse_mode:CLOpt.(Infer all_sections) ~meta:"dir" "Path to the .inferconfig file"
 
 and project_root =
-  CLOpt.mk_path ~deprecated:["project_root"; "-project_root"] ~long:"project-root" ~short:"pr"
+  CLOpt.mk_path ~deprecated:["project_root"; "-project_root"; "pr"] ~long:"project-root" ~short:'C'
     ~default:CLOpt.init_work_dir
     ~parse_mode:CLOpt.(Infer [Analysis;Clang;Driver;Print])
     ~meta:"dir" "Specify the root directory of the project"
@@ -513,7 +513,7 @@ and analyzer =
        documentation of this option *)
     | Capture | Compile | Infer | Eradicate | Checkers | Tracing | Crashcontext | Linters
     | Quandary | Threadsafety | Bufferoverrun -> () in
-  CLOpt.mk_symbol_opt ~deprecated:["analyzer"] ~long:"analyzer" ~short:"a"
+  CLOpt.mk_symbol_opt ~deprecated:["analyzer"] ~long:"analyzer" ~short:'a'
     ~parse_mode:CLOpt.(Infer [Driver])
     "Specify which analyzer to run (only one at a time is supported):\n\
      - infer, eradicate, checkers, quandary, threadsafety, bufferoverrun: run the specified analysis\n\
@@ -546,7 +546,7 @@ and array_level =
                  - 2 = assumes that all heap dereferences via array indexing and pointer \
                  arithmetic are correct"
 and ast_file =
-  CLOpt.mk_path_opt ~long:"ast-file" ~short:"ast"
+  CLOpt.mk_path_opt ~deprecated:["ast"] ~long:"ast-file"
     ~meta:"file" "AST file for the translation"
 
 and blacklist =
@@ -752,7 +752,7 @@ and (
       "Show internal exceptions"
 
   and filtering =
-    CLOpt.mk_bool ~long:"filtering" ~short:"f" ~default:true
+    CLOpt.mk_bool ~deprecated_no:["nf"] ~long:"filtering" ~short:'f' ~default:true
       ~parse_mode:CLOpt.(Infer [Driver])
       "Do not show the results from experimental checks (note: some of them may contain many false \
        alarms)"
@@ -788,7 +788,7 @@ and (
       "Produce dotty files for specs in the results directory"
   in
   let debug =
-    CLOpt.mk_bool_group ~deprecated:["debug"] ~long:"debug" ~short:"g"
+    CLOpt.mk_bool_group ~deprecated:["debug"] ~long:"debug" ~short:'g'
       ~parse_mode:CLOpt.(Infer [Driver])
       "Debug mode (also sets --developer-mode, --no-filtering, --print-buckets, --print-types, \
        --reports-include-ml-loc, --no-test, --trace-error, --write-dotty, --write-html)"
@@ -938,12 +938,12 @@ and from_json_report =
      files generated by the analysis)."
 
 and frontend_debug =
-  CLOpt.mk_bool ~long:"frontend-debug" ~short:"fd"
+  CLOpt.mk_bool ~deprecated:["fd"] ~deprecated_no:["nfd"] ~long:"frontend-debug"
     "Emit debug info to *.o.astlog and a script *.o.sh that replays the command used to run clang \
      with the plugin attached, piped to the InferClang frontend command (clang only)"
 
 and frontend_stats =
-  CLOpt.mk_bool ~long:"frontend-stats" ~short:"fs"
+  CLOpt.mk_bool ~deprecated:["fs"] ~deprecated_no:["nfs"] ~long:"frontend-stats"
     "Output statistics about the capture phase to *.o.astlog (clang only)"
 
 and frontend_tests =
@@ -957,7 +957,7 @@ and generated_classes =
     "Specify where to load the generated class files"
 
 and headers =
-  CLOpt.mk_bool ~deprecated:["headers"] ~deprecated_no:["no_headers"] ~long:"headers" ~short:"hd"
+  CLOpt.mk_bool ~deprecated:["headers"; "hd"] ~deprecated_no:["no_headers"; "nhd"] ~long:"headers"
     ~parse_mode:CLOpt.(Infer [Clang])
     "Analyze code in header files"
 
@@ -999,7 +999,7 @@ and java_jar_compiler =
     ~meta:"path" "Specifify the Java compiler jar used to generate the bytecode"
 
 and jobs =
-  CLOpt.mk_int ~deprecated:["-multicore"] ~long:"jobs" ~short:"j" ~default:ncpu
+  CLOpt.mk_int ~deprecated:["-multicore"] ~long:"jobs" ~short:'j' ~default:ncpu
     ~parse_mode:CLOpt.(Infer [Driver])
     ~meta:"int" "Run the specified number of analysis jobs simultaneously"
 
@@ -1025,7 +1025,7 @@ and linters_developer_mode =
      default linters and also sets --print-logs, --debug and --no-allowed-failures."
 
 and load_average =
-  CLOpt.mk_float_opt ~long:"load-average" ~short:"l"
+  CLOpt.mk_float_opt ~long:"load-average" ~short:'l'
     ~parse_mode:CLOpt.(Infer [Driver]) ~meta:"float"
     "Do not start new parallel jobs if the load average is greater than that specified (Buck and \
      make only)"
@@ -1145,7 +1145,8 @@ and procs_xml =
      --results-dir)"
 
 and progress_bar =
-  CLOpt.mk_bool ~deprecated_no:["no_progress_bar"] ~long:"progress-bar" ~short:"pb" ~default:true
+  CLOpt.mk_bool ~deprecated:["pb"] ~deprecated_no:["no_progress_bar"; "npb"] ~short:'p'
+    ~long:"progress-bar" ~default:true
     ~parse_mode:CLOpt.(Infer [Driver])
     "Show a progress bar"
 
@@ -1160,12 +1161,12 @@ and quandary_sinks =
     "Specify custom sinks for Quandary"
 
 and quiet =
-  CLOpt.mk_bool ~long:"quiet" ~short:"q" ~default:(current_exe <> Print)
+  CLOpt.mk_bool ~long:"quiet" ~short:'q' ~default:(current_exe <> Print)
     ~parse_mode:CLOpt.(Infer [Print])
     "Do not print specs on standard output"
 
 and reactive =
-  CLOpt.mk_bool ~deprecated:["reactive"] ~long:"reactive" ~short:"r"
+  CLOpt.mk_bool ~deprecated:["reactive"] ~long:"reactive" ~short:'r'
     "Reactive mode: the analysis starts from the files captured since the `infer` command started"
 
 and reactive_capture =
@@ -1213,7 +1214,7 @@ and rest =
     )
 
 and results_dir =
-  CLOpt.mk_path ~deprecated:["results_dir"; "-out"] ~long:"results-dir" ~short:"o"
+  CLOpt.mk_path ~deprecated:["results_dir"; "-out"] ~long:"results-dir" ~short:'o'
     ~default:(CLOpt.init_work_dir ^/ "infer-out")
     ~parse_mode:CLOpt.(Infer [Analysis;Clang;Driver;Print])
     ~meta:"dir" "Write results and internal files in the specified directory"
@@ -1264,7 +1265,7 @@ and spec_abs_level =
 
 and specs_library =
   let specs_library =
-    CLOpt.mk_path_list ~long:"specs-library" ~short:"lib"
+    CLOpt.mk_path_list ~deprecated:["lib"] ~long:"specs-library" ~short:'L'
       ~meta:"dir|jar" "Search for .spec files in given directory or jar file" in
   let _ =
     (* Given a filename with a list of paths, convert it into a list of string iff they are
@@ -1290,7 +1291,7 @@ and specs_library =
   specs_library
 
 and stacktrace =
-  CLOpt.mk_path_opt ~long:"stacktrace" ~short:"st" ~parse_mode:CLOpt.(Infer [Crashcontext])
+  CLOpt.mk_path_opt ~deprecated:["st"] ~long:"stacktrace" ~parse_mode:CLOpt.(Infer [Crashcontext])
     ~meta:"file" "File path containing a json-encoded Java crash stacktrace. Used to guide the \
                   analysis (only with '-a crashcontext').  See \
                   tests/codetoanalyze/java/crashcontext/*.json for examples of the expected format."
@@ -1321,7 +1322,8 @@ and test_filtering =
     "List all the files Infer can report on (should be called from the root of the project)"
 
 and testing_mode =
-  CLOpt.mk_bool ~deprecated:["testing_mode"; "-testing_mode"] ~long:"testing-mode" ~short:"tm"
+  CLOpt.mk_bool ~deprecated:["testing_mode"; "-testing_mode"; "tm"] ~deprecated_no:["ntm"]
+    ~long:"testing-mode"
     "Mode for testing, where no headers are translated, and dot files are created (clang only)"
 
 and threadsafe_aliases =
@@ -1413,7 +1415,7 @@ and xml_specs =
    Infer.run_javac for a version that looks inside argfiles, and discussion in D4397716. *)
 let javac_classes_out =
   CLOpt.mk_string ~parse_mode:CLOpt.Javac
-    ~deprecated:["classes_out"] ~short:"d" ~long:"" ~default:CLOpt.init_work_dir
+    ~deprecated:["classes_out"] ~long:"" ~short:'d' ~default:CLOpt.init_work_dir
     ~f:(fun classes_out ->
         if !buck then (
           let classes_out_infer = resolve classes_out ^/ buck_results_dir_name in
@@ -1426,7 +1428,7 @@ let javac_classes_out =
 
 and java_classpath =
   CLOpt.mk_string_opt ~parse_mode:CLOpt.Javac
-    ~deprecated:["classpath"] ~short:"cp" ~long:""
+    ~deprecated:["classpath";"cp"] ~long:""
     ~f:(fun classpath ->
         if !buck then (
           let paths = String.split classpath ~on:':' in
diff --git a/infer/tests/codetoanalyze/c/bufferoverrun/Makefile b/infer/tests/codetoanalyze/c/bufferoverrun/Makefile
index 1c1347076..0e1a95d5b 100644
--- a/infer/tests/codetoanalyze/c/bufferoverrun/Makefile
+++ b/infer/tests/codetoanalyze/c/bufferoverrun/Makefile
@@ -12,7 +12,7 @@ TESTS_DIR = ../../..
 
 ANALYZER = bufferoverrun
 CLANG_OPTIONS = -c
-INFER_OPTIONS = -nf --project-root $(TESTS_DIR) --no-failures-allowed
+INFER_OPTIONS = -F --project-root $(TESTS_DIR) --no-failures-allowed
 INFERPRINT_OPTIONS = --issues-tests
 
 SOURCES = \