diff --git a/sample/biorhythm.rb b/sample/biorhythm.rb
index 1c6d6fbad1..74e615a289 100644
--- a/sample/biorhythm.rb
+++ b/sample/biorhythm.rb
@@ -79,40 +79,38 @@ else
   if $OPT_birthday
     bd = Date.new(*parsedate($OPT_birthday))
   else
-    printf(STDERR, "Birthday                      (YYYYMMDD) : ")
-    if (si = STDIN.gets.chop) != ""
+    STDERR.print("Birthday                      (YYYYMMDD) : ")
+    unless (si = STDIN.gets.chop).empty?
       bd = Date.new(*parsedate(si))
     end
   end
   if !bd
-    printf STDERR, "BAD Input Birthday!!\n"
+    STDERR.print "BAD Input Birthday!!\n"
     exit()
   end
-  
+
   if $OPT_sdate
     dd = Date.today
   elsif $OPT_date
     dd = Date.new(*parsedate($OPT_date))
   else
-    printf(STDERR, "Date        [<RETURN> for Systemdate] (YYYYMMDD) : ")
-    if (si = STDIN.gets.chop) != ""
+    STDERR.print("Date        [<RETURN> for Systemdate] (YYYYMMDD) : ")
+    unless (si = STDIN.gets.chop).empty?
       dd = Date.new(*parsedate(si))
     end
   end
-  if !dd
-    dd = Date.today
-  end
+  dd ||= Date.today
 
   if $OPT_v
     ausgabeart = "v"
   elsif $OPT_g
     ausgabeart = "g"
   else
-    printf(STDERR, "Values for today or Graph  (v/g) [default g] : ")
+    STDERR.print("Values for today or Graph  (v/g) [default g] : ")
     ausgabeart = STDIN.gets.chop
   end
 end
-if (ausgabeart == "v")
+if ausgabeart == "v"
   printHeader(bd.year, bd.month, bd.day, dd - bd, name_of_week(bd))
   print "\n"
   
@@ -128,9 +126,9 @@ else
   elsif $OPT_D
     display_period = 9
   else
-    printf(STDERR, "Graph for how many days     [default 10] : ")
+    STDERR.printf("Graph for how many days     [default 10] : ")
     display_period = STDIN.gets.chop
-    if (display_period == "")
+    if display_period.empty?
       display_period = 9
     else
       display_period = display_period.to_i - 1
diff --git a/sample/clnt.rb b/sample/clnt.rb
index 4f96ca4089..0f3d17bf19 100644
--- a/sample/clnt.rb
+++ b/sample/clnt.rb
@@ -3,15 +3,19 @@
 
 require "socket"
 
-host=(if ARGV.length == 2; ARGV.shift; else "localhost"; end)
+if ARGV.length >= 2
+  host = ARGV.shift
+else
+  host = "localhost"
+end
 print("Trying ", host, " ...")
 STDOUT.flush
 s = TCPSocket.open(host, ARGV.shift)
 print(" done\n")
 print("addr: ", s.addr.join(":"), "\n")
 print("peer: ", s.peeraddr.join(":"), "\n")
-while gets()
-  s.write($_)
+while line = gets()
+  s.write(line)
   print(s.readline)
 end
 s.close
diff --git a/sample/svr.rb b/sample/svr.rb
index af566056b7..6169861abc 100644
--- a/sample/svr.rb
+++ b/sample/svr.rb
@@ -9,7 +9,7 @@ addr.shift
 printf("server is on %s\n", addr.join(":"))
 socks = [gs]
 
-while TRUE
+loop do
   nsock = select(socks);
   next if nsock == nil
   for s in nsock[0]
@@ -23,7 +23,7 @@ while TRUE
 	s.close
 	socks.delete(s)
       else
-	if str = s.gets;
+	if str = s.gets
 	  s.write(str)
 	end
       end