diff --git a/.mise.toml b/.mise.toml
index c8adb6e..3986447 100644
--- a/.mise.toml
+++ b/.mise.toml
@@ -3,6 +3,7 @@ ffmpeg = "latest"
 jq = "latest"
 "pipx:mkb79/audible-cli" = "master"
 "cargo:refile-m4b" = "latest"
+fd = "latest"
 fzf = "latest"
 python = "latest"
 pipx = "latest"
diff --git a/README.md b/README.md
index 0a5e4e9..5cc09ce 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ Mise will be used to install the other dependencies. If you don't want to use `m
 
 - [just](https://just.systems/)
 - [audible-cli](https://github.com/mkb79/audible-cli) (recommended installation instuctions below)
+- [fd](https://github.com/sharkdp/fd)
 - [fzf](https://github.com/junegunn/fzf)
 - [jq](https://jqlang.github.io/jq/)
 - [ffmpeg](https://ffmpeg.org)
diff --git a/justfile b/justfile
index c5e12af..aed0051 100644
--- a/justfile
+++ b/justfile
@@ -54,27 +54,35 @@ post-download:
 convert: convert-aax convert-aaxc
 
 convert-aax:
+  #!/usr/bin/env bash
   just _require_dir M4B
-  [ -f AAX/*.aax ] && for F in AAX/*.aax ; \
-  do \
-    O=M4B/$(basename $F .aax).m4b ; \
-    ffmpeg \
-      -y \
-      -activation_bytes $(jq .activation_bytes ~/.audible/audible.json | tr '\"' ' ') \
-      -i $F \
-      -codec copy \
-      $O && \
-    rm $F ; \
-  done || true
+  if [ $(fd --glob 'AAX/*.aax' | wc -l) -gt 0 ]
+  then
+    for F in AAX/*.aax
+    do
+      O=M4B/$(basename $F .aax).m4b
+      ffmpeg \
+        -y \
+        -activation_bytes $(jq .activation_bytes ~/.audible/audible.json | tr '\"' ' ') \
+        -i $F \
+        -codec copy \
+        $O
+      rm $F
+    done
+  fi
 
 convert-aaxc:
+  #!/usr/bin/env bash
   just _require_dir M4B
-  [ -f AAXC/*.aaxc ] && for AAXC in AAXC/*.aaxc ; \
-  do \
-    VOUCHER="${AAXC%.aaxc}.voucher" ; \
-    M4B="M4B/$(basename ${AAXC%.aaxc}).m4b" ; \
-    just _convert-one-aaxc $AAXC $VOUCHER $M4B ; \
-  done || true
+  if [ $(fd --glob 'AAXC/*.aaxc' | wc -l) -gt 0 ]
+  then
+    for AAXC in AAXC/*.aaxc
+    do
+      VOUCHER="${AAXC%.aaxc}.voucher"
+      M4B="M4B/$(basename ${AAXC%.aaxc}).m4b"
+      just _convert-one-aaxc $AAXC $VOUCHER $M4B
+    done
+  fi
 
 _convert-one-aaxc aaxc_file voucher_file m4b_file:
   #!/usr/bin/env bash
@@ -94,10 +102,20 @@ refile:
   refile-m4b M4B
 
 archive:
-  [ -d "${AUDIOBOOK_ARCHIVE}" ] || (echo "ERROR: No archive specified" ; exit 1)
-  [ -f M4B/* ] || (echo "WARN: Nothing to be archived" ; exit 1)
-  cd M4B && cp -v -R * "${AUDIOBOOK_ARCHIVE}" 
-  just _clean M4B
+  #!/usr/bin/env bash
+  if [ -d M4B ] && [ -n "${AUDIOBOOK_ARCHIVE}" ] && [ -d "${AUDIOBOOK_ARCHIVE}" ];
+  then
+    if [ $(fd . M4B | wc -l) -eq 0 ]
+    then
+      echo "WARN: Nothing to be archived"
+      exit 1
+    fi
+    cd M4B && cp -v -R * "${AUDIOBOOK_ARCHIVE}" 
+    just _clean M4B/*
+  else
+    echo "ERROR: No archive specified or no M4B directory"
+    exit 1
+  fi
 
 clean:
   for target in TEMP/* AAX/* AAXC/* M4B/* ; do just _clean $target ; done