diff --git a/lib/youplot/command.rb b/lib/youplot/command.rb
index a7d090c..ac4c281 100644
--- a/lib/youplot/command.rb
+++ b/lib/youplot/command.rb
@@ -178,9 +178,9 @@ module YouPlot
         @backend.barplot(data, params, count: true, reverse: options[:reverse])
       when :hist, :histogram
         @backend.histogram(data, params)
-      when :line, :lineplot
+      when :line, :lineplot, :l
         @backend.line(data, params, options[:fmt])
-      when :lines, :lineplots
+      when :lines, :lineplots, :ls
         @backend.lines(data, params, options[:fmt])
       when :scatter, :s
         @backend.scatter(data, params, options[:fmt])
diff --git a/lib/youplot/parser.rb b/lib/youplot/parser.rb
index 26415d0..ebcd452 100644
--- a/lib/youplot/parser.rb
+++ b/lib/youplot/parser.rb
@@ -291,14 +291,14 @@ module YouPlot
           params.nbins = v
         end
 
-      when :lineplot, :line
+      when :lineplot, :line, :l
         sub_parser_add_canvas
         sub_parser_add_grid
         sub_parser_add_fmt_yx
         sub_parser_add_ylim
         sub_parser_add_xlim
 
-      when :lineplots, :lines
+      when :lineplots, :lines, :ls
         sub_parser_add_canvas
         sub_parser_add_grid
         sub_parser_add_fmt_xyxy
diff --git a/test/youplot/iris_test.rb b/test/youplot/iris_test.rb
index 4246d99..b5b2170 100644
--- a/test/youplot/iris_test.rb
+++ b/test/youplot/iris_test.rb
@@ -69,6 +69,12 @@ class YouPlotIRISTest < Test::Unit::TestCase
     assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
   end
 
+  # l is an undocumented alias of lineplot.
+  test :l do
+    YouPlot::Command.new(['l', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
+    assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
+  end
+
   test :lineplots do
     YouPlot::Command.new(['lineplots', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
     assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
@@ -79,6 +85,12 @@ class YouPlotIRISTest < Test::Unit::TestCase
     assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
   end
 
+  # ls is an undocumented alias of lineplots.
+  test :ls do
+    YouPlot::Command.new(['lines', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
+    assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
+  end
+
   test :scatter do
     YouPlot::Command.new(['scatter', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
     assert_equal fixture('iris-scatter.txt'), @stderr_file.read