diff --git a/lib/colorls/core.rb b/lib/colorls/core.rb
index 7b968d5..db8f461 100644
--- a/lib/colorls/core.rb
+++ b/lib/colorls/core.rb
@@ -11,7 +11,7 @@ module ColorLS
   class Core
     def initialize(input, all: false, report: false, sort: false, show: false,
       mode: nil, git_status: false, almost_all: false, colors: [], group: nil,
-      reverse: false, hyperlink: false, tree_depth: nil)
+      reverse: false, hyperlink: false, tree_depth: nil, show_group: true, show_user: true)
       @input        = (+input).force_encoding(ColorLS.file_encoding)
       @count        = {folders: 0, recognized_files: 0, unrecognized_files: 0}
       @all          = all
@@ -23,7 +23,7 @@ module ColorLS
       @group        = group
       @show         = show
       @one_per_line = mode == :one_per_line
-      @long         = mode == :long
+      init_long_format(mode,show_group,show_user)
       @tree         = {mode: mode == :tree, depth: tree_depth}
       @horizontal   = mode == :horizontal
       process_git_status_details(git_status)
@@ -75,6 +75,12 @@ module ColorLS
       end
     end
 
+    def init_long_format(mode,show_group,show_user)
+      @long = mode == :long
+      @show_group = show_group
+      @show_user = show_user
+    end
+
     # how much characters an item occupies besides its name
     CHARS_PER_ITEM = 12
 
@@ -274,8 +280,11 @@ module ColorLS
 
       links = content.nlink.to_s.rjust(@linklength)
 
-      [mode_info(content.stats), links, user_info(content), group_info(content.group),
-       size_info(content.size), mtime_info(content.mtime)].join('  ')
+      line_array = [mode_info(content.stats), links]
+      line_array.push user_info(content) if @show_user
+      line_array.push group_info(content.group) if @show_group
+      line_array.concat [size_info(content.size), mtime_info(content.mtime)]
+      line_array.join('   ')
     end
 
     def symlink_info(content)
diff --git a/lib/colorls/flags.rb b/lib/colorls/flags.rb
index 168d480..60bd0ab 100644
--- a/lib/colorls/flags.rb
+++ b/lib/colorls/flags.rb
@@ -10,19 +10,7 @@ module ColorLS
       @args = args
       @light_colors = false
 
-      @opts = {
-        show: false,
-        sort: true,
-        reverse: false,
-        group: nil,
-        mode: STDOUT.tty? ? :vertical : :one_per_line, # rubocop:disable Style/GlobalStdStream
-        all: false,
-        almost_all: false,
-        report: false,
-        git_status: false,
-        colors: [],
-        tree_depth: 3
-      }
+      @opts = default_opts
 
       parse_options
 
@@ -81,6 +69,24 @@ module ColorLS
       warn "WARN: #{e}, check your locale settings"
     end
 
+    def default_opts
+      {
+        show: false,
+        sort: true,
+        reverse: false,
+        group: nil,
+        mode: STDOUT.tty? ? :vertical : :one_per_line, # rubocop:disable Style/GlobalStdStream
+        all: false,
+        almost_all: false,
+        report: false,
+        git_status: false,
+        colors: [],
+        tree_depth: 3,
+        show_group: true,
+        show_user: true
+      }
+    end
+
     def add_sort_options(options)
       options.separator ''
       options.separator 'sorting options:'
@@ -126,8 +132,7 @@ module ColorLS
         when 'single-column' then @opts[:mode] = :one_per_line
         end
       end
-      options.on('-1', 'list one file per line')                          { @opts[:mode] = :one_per_line }
-      options.on('-l', '--long', 'use a long listing format')             { @opts[:mode] = :long }
+      options.on('-1', 'list one file per line') { @opts[:mode] = :one_per_line }
       options.on('--tree=[DEPTH]', Integer, 'shows tree view of the directory') do |depth|
         @opts[:tree_depth] = depth
         @opts[:mode] = :tree
@@ -136,6 +141,19 @@ module ColorLS
       options.on('-C', 'list entries by columns instead of by lines')     { @opts[:mode] = :vertical }
     end
 
+    def add_long_style_options(options)
+      options.on('-l', '--long', 'use a long listing format')             { @opts[:mode] = :long }
+      options.on('-o', 'use a long listing format without group information') do
+        @opts[:mode] = :long
+        @opts[:show_group] = false
+      end
+      options.on('-g', 'use a long listing format without owner information') do
+        @opts[:mode] = :long
+        @opts[:show_user] = false
+      end
+      options.on('-G', '--no-group', 'show no group information in a long listing') { @opts[:show_group] = false }
+    end
+
     def add_general_options(options)
       options.separator ''
       options.separator 'general options:'
@@ -196,17 +214,22 @@ module ColorLS
 EXAMPLES
     end
 
+    def assign_each_options(opts)
+      add_common_options(opts)
+      add_format_options(opts)
+      add_long_style_options(opts)
+      add_sort_options(opts)
+      add_compatiblity_options(opts)
+      add_general_options(opts)
+      add_help_option(opts)
+    end
+
     def parse_options
       @parser = OptionParser.new do |opts|
         opts.banner = 'Usage:  colorls [OPTION]... [FILE]...'
         opts.separator ''
 
-        add_common_options(opts)
-        add_format_options(opts)
-        add_sort_options(opts)
-        add_compatiblity_options(opts)
-        add_general_options(opts)
-        add_help_option(opts)
+        assign_each_options(opts)
 
         opts.on_tail('--version', 'show version') do
           puts ColorLS::VERSION
diff --git a/man/colorls.1 b/man/colorls.1
index 93234eb..d050b46 100644
--- a/man/colorls.1
+++ b/man/colorls.1
@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "COLORLS" "1" "October 2020" "colorls 1.4.2" "colorls Manual"
+.TH "COLORLS" "1" "November 2020" "colorls 1.4.2" "colorls Manual"
 .
 .SH "NAME"
 \fBcolorls\fR \- list directory contents with colors and icons
@@ -55,10 +55,6 @@ use format: across (\-x), horizontal (\-x), long (\-l), single\-column (\-1), ve
 list one file per line
 .
 .TP
-\fB\-l\fR, \fB\-\-long\fR
-use a long listing format
-.
-.TP
 \fB\-\-tree\fR
 shows tree view of the directory
 .
@@ -71,6 +67,22 @@ list entries by lines instead of by columns
 list entries by columns instead of by lines
 .
 .TP
+\fB\-l\fR, \fB\-\-long\fR
+use a long listing format
+.
+.TP
+\fB\-o\fR
+use a long listing format without group information
+.
+.TP
+\fB\-g\fR
+use a long listing format without owner information
+.
+.TP
+\fB\-G\fR, \fB\-\-no\-group\fR
+show no group information in a long listing
+.
+.TP
 \fB\-\-sd\fR, \fB\-\-sort\-dirs\fR, \fB\-\-group\-directories\-first\fR
 sort directories first
 .
diff --git a/spec/color_ls/flags_spec.rb b/spec/color_ls/flags_spec.rb
index a6e6957..2932543 100644
--- a/spec/color_ls/flags_spec.rb
+++ b/spec/color_ls/flags_spec.rb
@@ -325,4 +325,156 @@ RSpec.describe ColorLS::Flags do
       expect(subject).to eq 2
     end
   end
+
+  context 'with -o flag' do
+    let(:args) { ['-o', "#{FIXTURES}/a.txt"] }
+
+    before do
+      fileInfo = instance_double(
+        'FileInfo',
+        :group => "sys",
+        :mtime => Time.now,
+        :directory? => false,
+        :owner => "user",
+        :name => "a.txt",
+        :show => "a.txt",
+        :nlink => 1,
+        :size => 128,
+        :blockdev? => false,
+        :chardev? => false,
+        :socket? => false,
+        :symlink? => false,
+        :stats => OpenStruct.new(
+          mode: 0o444, # read for user, owner, other
+          setuid?: true,
+          setgid?: true,
+          sticky?: true
+        ),
+        :executable? => false
+      )
+
+      allow(ColorLS::FileInfo).to receive(:new).with("#{FIXTURES}/a.txt", link_info: true) { fileInfo }
+    end
+
+    it 'lists without group info' do
+      expect { subject }.not_to output(/sys/).to_stdout
+    end
+    it 'lists with user info' do
+      expect { subject }.to output(/user/).to_stdout
+    end
+  end
+
+  context 'with -g flag' do
+    let(:args) { ['-g', "#{FIXTURES}/a.txt"] }
+
+    before do
+      fileInfo = instance_double(
+        'FileInfo',
+        :group => "sys",
+        :mtime => Time.now,
+        :directory? => false,
+        :owner => "user",
+        :name => "a.txt",
+        :show => "a.txt",
+        :nlink => 1,
+        :size => 128,
+        :blockdev? => false,
+        :chardev? => false,
+        :socket? => false,
+        :symlink? => false,
+        :stats => OpenStruct.new(
+          mode: 0o444, # read for user, owner, other
+          setuid?: true,
+          setgid?: true,
+          sticky?: true
+        ),
+        :executable? => false
+      )
+
+      allow(ColorLS::FileInfo).to receive(:new).with("#{FIXTURES}/a.txt", link_info: true) { fileInfo }
+    end
+
+    it 'lists with group info' do
+      expect { subject }.to output(/sys/).to_stdout
+    end
+    it 'lists without user info' do
+      expect { subject }.not_to output(/user/).to_stdout
+    end
+  end
+
+  context 'with -o and -g flag' do
+    let(:args) { ['-og', "#{FIXTURES}/a.txt"] }
+
+    before do
+      fileInfo = instance_double(
+        'FileInfo',
+        :group => "sys",
+        :mtime => Time.now,
+        :directory? => false,
+        :owner => "user",
+        :name => "a.txt",
+        :show => "a.txt",
+        :nlink => 1,
+        :size => 128,
+        :blockdev? => false,
+        :chardev? => false,
+        :socket? => false,
+        :symlink? => false,
+        :stats => OpenStruct.new(
+          mode: 0o444, # read for user, owner, other
+          setuid?: true,
+          setgid?: true,
+          sticky?: true
+        ),
+        :executable? => false
+      )
+
+      allow(ColorLS::FileInfo).to receive(:new).with("#{FIXTURES}/a.txt", link_info: true) { fileInfo }
+    end
+
+    it 'lists without group info' do
+      expect { subject }.not_to output(/sys/).to_stdout
+    end
+    it 'lists without user info' do
+      expect { subject }.not_to output(/user/).to_stdout
+    end
+  end
+
+  context 'with -G flag in a listing format' do
+    let(:args) { ['-l', '-G', "#{FIXTURES}/a.txt"] }
+
+    before do
+      fileInfo = instance_double(
+        'FileInfo',
+        :group => "sys",
+        :mtime => Time.now,
+        :directory? => false,
+        :owner => "user",
+        :name => "a.txt",
+        :show => "a.txt",
+        :nlink => 1,
+        :size => 128,
+        :blockdev? => false,
+        :chardev? => false,
+        :socket? => false,
+        :symlink? => false,
+        :stats => OpenStruct.new(
+          mode: 0o444, # read for user, owner, other
+          setuid?: true,
+          setgid?: true,
+          sticky?: true
+        ),
+        :executable? => false
+      )
+
+      allow(ColorLS::FileInfo).to receive(:new).with("#{FIXTURES}/a.txt", link_info: true) { fileInfo }
+    end
+
+    it 'lists without group info' do
+      expect { subject }.not_to output(/sys/).to_stdout
+    end
+    it 'lists with user info' do
+      expect { subject }.to output(/user/).to_stdout
+    end
+  end
 end
diff --git a/zsh/_colorls b/zsh/_colorls
index 631dc10..0d90fcd 100644
--- a/zsh/_colorls
+++ b/zsh/_colorls
@@ -17,11 +17,15 @@ _arguments -s -S \
   "--report[show brief report]" \
   "--format[use format: across (-x), horizontal (-x), long (-l), single-column (-1), vertical (-C)]" \
   "-1[list one file per line]" \
-  "-l[use a long listing format]" \
-  "--long[use a long listing format]" \
   "--tree[shows tree view of the directory]" \
   "-x[list entries by lines instead of by columns]" \
   "-C[list entries by columns instead of by lines]" \
+  "-l[use a long listing format]" \
+  "--long[use a long listing format]" \
+  "-o[use a long listing format without group information]" \
+  "-g[use a long listing format without owner information]" \
+  "-G[show no group information in a long listing]" \
+  "--no-group[show no group information in a long listing]" \
   "--sd[sort directories first]" \
   "--sort-dirs[sort directories first]" \
   "--group-directories-first[sort directories first]" \