1 files changed, 7 insertions, 2 deletions
diff --git a/bin/erb b/bin/erb
index 86f7042fae..d060caba90 100755
--- a/bin/erb
+++ b/bin/erb
@@ -75,6 +75,7 @@ class ERB
           when '-r'                        # require
             require ARGV.req_arg
           when '-S'                        # security level
+            warn 'warning: -S option of erb command is deprecated. Please do not use this.'
             arg = ARGV.req_arg
             raise "invalid safe_level #{arg.dump}" unless arg =~ /\A[0-1]\z/
             safe_level = arg.to_i
@@ -112,7 +113,6 @@ class ERB
   -v               enable verbose mode
   -d               set $DEBUG to true
   -r library       load a library
-  -S safe_level    set $SAFE (0..1)
   -E ex[:in]       set default external/internal encodings
   -U               set default encoding to UTF-8.
   -T trim_mode     specify trim_mode (0..2, -)
@@ -127,7 +127,12 @@ EOU
       filename = $FILENAME
       exit 2 unless src
       trim = trim_mode_opt(trim_mode, disable_percent)
-      erb = factory.new(src.untaint, safe_level, trim)
+      if safe_level.nil?
+        erb = factory.new(src.untaint, trim_mode: trim)
+      else
+        # [deprecated] This will be removed at Ruby 2.7.
+        erb = factory.new(src.untaint, safe_level, trim_mode: trim)
+      end
       erb.filename = filename
       if output
         if number