diff --git a/bin/cron/osh-encrypt-rsync.pl b/bin/cron/osh-encrypt-rsync.pl
index e0de5d0..6ee251e 100755
--- a/bin/cron/osh-encrypt-rsync.pl
+++ b/bin/cron/osh-encrypt-rsync.pl
@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 
-use GnuPG;
+use GnuPG;    # pragma optional module
 use File::Temp;
 use File::Basename;
 use File::Find;
diff --git a/bin/dev/perl-check.sh b/bin/dev/perl-check.sh
index ad863f1..4d008ad 100755
--- a/bin/dev/perl-check.sh
+++ b/bin/dev/perl-check.sh
@@ -35,9 +35,8 @@ do
         grep -q '^use common::sense;' "$i" || echo "(missing common::sense in $i)"
     fi
 done
-if [ -x "$basedir/bin/dev/perl-use-all.pl" ] ; then
-    action_detail "Trying to \`use' all required perl modules"
-    "$basedir/bin/dev/perl-use-all.pl" || (( fails++ ))
+if [ -x "$basedir/bin/dev/perl-use-all.sh" ] ; then
+    "$basedir/bin/dev/perl-use-all.sh" || (( fails++ ))
 fi
 
 if [ "$fails" -ne 0 ] ; then
diff --git a/bin/dev/perl-use-all.pl b/bin/dev/perl-use-all.pl
deleted file mode 100755
index a34f1b9..0000000
--- a/bin/dev/perl-use-all.pl
+++ /dev/null
@@ -1,56 +0,0 @@
-#! /usr/bin/env perl
-# vim: set filetype=perl ts=4 sw=4 sts=4 et:
-
-use strict;
-use warnings;
-
-use Carp;
-use CGI;
-use common::sense;
-use Config;
-use Cwd;
-use Data::Dumper;
-use DBD::SQLite;
-use Digest::MD5;
-use Digest::SHA;
-use Exporter;
-use Fcntl;
-use File::Basename;
-use File::Copy;
-use File::Find;
-use File::Path;
-use File::Temp;
-use Getopt::Long;
-use HTTP::Headers;
-use HTTP::Message;
-use HTTP::Request;
-use IO::Compress::Gzip;
-use IO::Handle;
-use IO::Pipe;
-use IO::Select;
-use IO::Socket::SSL;
-use IPC::Open2;
-use IPC::Open3;
-use JSON;
-use List::Util;
-use LWP::UserAgent;
-use MIME::Base64;
-use Net::IP;
-use Net::Netmask;
-use Net::Server::PreFork;
-use Net::Server::PreForkSimple;
-use POSIX;
-use Scalar::Util;
-use Socket;
-use Storable;
-use Symbol;
-use Sys::Hostname;
-use Sys::Syslog;
-use Term::ANSIColor;
-use Term::ReadKey;
-use Term::ReadLine;
-use Time::HiRes;
-use Time::Piece;
-use URI;
-
-print "OK: all required Perl modules are present\n";
diff --git a/bin/dev/perl-use-all.sh b/bin/dev/perl-use-all.sh
new file mode 100755
index 0000000..dbb9cf0
--- /dev/null
+++ b/bin/dev/perl-use-all.sh
@@ -0,0 +1,39 @@
+#! /usr/bin/env bash
+# vim: set filetype=sh ts=4 sw=4 sts=4 et:
+
+basedir=$(readlink -f "$(dirname "$0")"/../..)
+# shellcheck source=lib/shell/functions.inc
+. "$basedir"/lib/shell/functions.inc
+
+action_doing "Checking list of needed Perl modules..."
+
+missing=""
+
+# shellcheck disable=SC2013
+for module in $(grep -RhEw '(use|require) ([a-zA-Z][a-zA-Z0-9_:]+)' "$basedir/lib/perl/" "$basedir/bin/" | \
+    grep -v -e '"' -e "'" -e '# pragma optional module' -e OVH:: | \
+    sed -re 's/#.*//' | \
+    grep -Eo '(use|require) ([a-zA-Z][a-zA-Z0-9_:]+)' | \
+    awk '{print $2}' | \
+    sort -u | \
+    grep -Ev '^[a-z0-9_]+$')
+do
+    if [ "$1" != "corelist" ]; then
+        action_detail "$module"
+        if ! perl -M"$module" -e 1; then
+            action_detail "... failed!"
+            missing="$missing $module"
+        fi
+    else
+        if corelist "$module" | grep -q 'not in CORE'; then
+            action_detail "$module"
+        fi
+    fi
+done
+
+if [ -n "$missing" ]; then
+    action_error "Missing modules:$missing"
+else
+    # shellcheck disable=SC2119
+    action_done
+fi
diff --git a/bin/shell/connect.pl b/bin/shell/connect.pl
index fa188f4..e7bf334 100755
--- a/bin/shell/connect.pl
+++ b/bin/shell/connect.pl
@@ -44,7 +44,7 @@ local $0 = '' . __FILE__ . ' ' . join(' ', @command);
 
 # set signal for when my parent dies (Linux only)
 eval {
-    require Linux::Prctl;
+    require Linux::Prctl;    # pragma optional module
 
     # 1 is SIGHUP
     Linux::Prctl::set_pdeathsig(1);
diff --git a/bin/shell/osh.pl b/bin/shell/osh.pl
index a932bef..37a54dd 100755
--- a/bin/shell/osh.pl
+++ b/bin/shell/osh.pl
@@ -1431,7 +1431,7 @@ sub exit_sig {
 sub help {
 
 =cut just to debug memory fingerprint
-    use Devel::Size qw[total_size];
+    use Devel::Size qw[total_size]; # pragma optional module
     my %siz;
     foreach (keys %::main::main::)
     {