diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..b58b603
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..99c3911
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/plugin-apt.iml" filepath="$PROJECT_DIR$/.idea/plugin-apt.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/plugin-apt.iml b/.idea/plugin-apt.iml
new file mode 100644
index 0000000..0c8867d
--- /dev/null
+++ b/.idea/plugin-apt.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/completions/apt.fish b/completions/apt.fish
index 5020a66..7899c2c 100644
--- a/completions/apt.fish
+++ b/completions/apt.fish
@@ -10,6 +10,10 @@ complete -c apt -n "__fish_use_subcommand" -a clean -f
 
 complete -c apt -n "__fish_use_subcommand" -a "install in" -x
 
+complete -c apt -n "__fish_use_subcommand" -a installed -f
+
+complete -c apt -n "__fish_use_subcommand" -a list -f
+
 complete -c apt -n "__fish_use_subcommand" -a policy -f
 
 complete -c apt -n "__fish_use_subcommand" -a ppa -x
diff --git a/functions/apt.fish b/functions/apt.fish
index 7f25a8e..0788894 100755
--- a/functions/apt.fish
+++ b/functions/apt.fish
@@ -51,6 +51,12 @@ function apt -d "Short and friendly command wrapper for APT"
     case install in
       sudo apt-get $apt_get_flags install $argv[2..-1]
 
+    case installed
+      command apt list --installed $argv[2..-1]
+
+    case list
+      command apt list $argv[2..-1]
+
     case policy
       env LANG=C apt-cache policy
 
diff --git a/functions/apt.help.fish b/functions/apt.help.fish
index 6739451..ffc1ee5 100644
--- a/functions/apt.help.fish
+++ b/functions/apt.help.fish
@@ -13,6 +13,8 @@ Commands:
   check       Verify that there are no broken dependencies.
   clean       Erase old downloaded archive files.
   install     [Alias: in] Install packages.
+  installed   List all installed packages (can be filtered)
+  list        List all packages (can be filtered)
   policy      Shows policy settings.
   ppa         Adds or removes PPA packages sources.
   purge       Removes packages and their configuration files.