diff --git a/lib/filefct.sh b/lib/filefct.sh
index 754eee2..5e41282 100644
--- a/lib/filefct.sh
+++ b/lib/filefct.sh
@@ -1,5 +1,6 @@
 # ------------------------------------------------------------------------------
 # File manipulation function
+# This file is part of the init.sh project
 # Copyright (c) 2019-2021 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
 # ------------------------------------------------------------------------------
 # This file is distributed under 3-clause BSD license.
@@ -30,7 +31,11 @@ backupdist()
         if [[ -f ${file} ]]; then
             local tmstmp=$(stdtime)
             prnt I "Création d'une sauvegarde de ${file} du $tmstmp..."
-            if [[ ! cp -av $file $file.dist.$tmstmp ]]; then
+            cp -av $file ${file}.dist.${tmstmp}
+            if [[ $? -ne 0 ]]; then
+                prnt E "backupdist(): Échec de copie du fichier."
+                die 12
+            fi
         else
             prnt E "backupdist(): Le paramètre fournis ($file) n'est pas un fichier."
             die 7
@@ -68,18 +73,20 @@ installfile()
         fi
     done
     for i in $filelist; do :; done
-    if [[ ! $i==/* ]]; then
+    if [[ ! $i == /* ]]; then
         prnt E "installfile(): Target must be on the root filesystem and fuul path must be provided."
         die 13
     fi
     if [[ -d $(dirname $i) ]]; then
         prnt I "Création du répertoire $(dirname $i) d'accueil..."
-        if [[ ! mkdir -pv $(dirname $i) ]]; then
+        mkdir -pv $(dirname $i)
+        if [[ $? -ne 0 ]]; then
             prnt E "installfile(): Can't create target dirrectory!"
             die 12
         fi
     prnt I "Copie des fichiers ${filelist}..."
-    if [[ ! cp -av $filelist ]]; then
+    cp -av $filelist
+    if [[ $? -ne 0 ]]; then
         prnt E "installfile(): Couldn't copy some required files!" &&
         die 12
     fi