diff --git a/sdata/subcmd-checkdeps/0.run.sh b/sdata/subcmd-checkdeps/0.run.sh
new file mode 100644
index 000000000..b61d68bed
--- /dev/null
+++ b/sdata/subcmd-checkdeps/0.run.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Check whether pkgs exist in AUR or repos of Arch.
+#
+# Do NOT abuse this since it consumes extra bandwidth from AUR server.
+
+pkglistfile=$(mktemp)
+pkglistfile_orig=${LIST_FILE_PATH}
+mkdir -p ./cache
+pkglistfile_orig_s=./cache/dependencies_stripped.conf
+remove_bashcomments_emptylines $pkglistfile_orig $pkglistfile_orig_s
+
+cat $pkglistfile_orig_s | sed "s_\ _\n_g" > $pkglistfile
+
+echo "The non-existent pkgs in $pkglistfile_orig are listed as follows."
+# Borrowed from https://bbs.archlinux.org/viewtopic.php?pid=1490795#p1490795
+comm -23 <(sort -u $pkglistfile) <(sort -u <(wget -q -O - https://aur.archlinux.org/packages.gz | gunzip) <(pacman -Ssq))
+echo "End of list. If nothing appears, then all pkgs exist."
+rm $pkglistfile
+
diff --git a/sdata/subcmd-checkdeps/options.sh b/sdata/subcmd-checkdeps/options.sh
new file mode 100644
index 000000000..903a9c71d
--- /dev/null
+++ b/sdata/subcmd-checkdeps/options.sh
@@ -0,0 +1,48 @@
+# Handle args for subcmd: exp-uninstall
+# shellcheck shell=bash
+
+showhelp(){
+echo -e "Syntax: $0 checkdeps [OPTIONS]...
+
+Experimental unintallation.
+
+Options:
+  -h, --help       Show this help message
+      --file       A file in plain text containing package names
+"
+}
+# `man getopt` to see more
+para=$(getopt \
+  -o h \
+  -l help,file: \
+  -n "$0" -- "$@")
+[ $? != 0 ] && echo "$0: Error when getopt, please recheck parameters." && exit 1
+#####################################################################################
+## getopt Phase 1
+# ignore parameter's order, execute options below first
+eval set -- "$para"
+while true ; do
+  case "$1" in
+    -h|--help) showhelp;exit;;
+    --) break ;;
+    *) shift ;;
+  esac
+done
+#####################################################################################
+## getopt Phase 2
+
+eval set -- "$para"
+while true ; do
+  case "$1" in
+    ## Ones with parameter
+    --file)
+    if [[ -f "$2" ]];
+      then echo "Using list file \"$2\".";LIST_FILE_PATH="$2";shift 2
+      else echo "Wrong argument for $1.";exit 1
+    fi;;
+
+    ## Ending
+    --) break ;;
+    *) echo -e "$0: Wrong parameters.";exit 1;;
+  esac
+done
diff --git a/setup b/setup
index 170e43464..cae0a1928 100755
--- a/setup
+++ b/setup
@@ -24,6 +24,7 @@ Subcommands:
   exp-uninstall  (Experimental) Uninstall illogical-impulse.
   exp-update     (Experimental) Update illogical-impulse without fully reinstall.
   exp-update-old (Experimental) exp-update but use behaves like old version.
+  checkdeps      (For dev only) Check whether pkgs exist in AUR or repos of Arch.
   help           Show this help message.
 
 For each <subcommand>, use -h for details:
@@ -34,7 +35,7 @@ case $1 in
   # Global help
   help|--help|-h)showhelp_global;exit;;
   # Correct subcommand
-  install|exp-uninstall|exp-update|exp-update-old)
+  install|exp-uninstall|exp-update|exp-update-old|checkdeps)
     SUBCMD_NAME=$1
     SUBCMD_DIR=./sdata/subcmd-$1
     shift;;