diff --git a/ssh_tools/multicopy.sh b/ssh_tools/multicopy.sh
index c7179f9..c1e88ed 100755
--- a/ssh_tools/multicopy.sh
+++ b/ssh_tools/multicopy.sh
@@ -16,7 +16,7 @@ set -u
 
 # Exit codes
 readonly EXIT_SUCCESS=0
-readonly EXIT_USAGE=1
+readonly EXIT_USAGE=127
 readonly EXIT_DEPENDENCY=4
 readonly EXIT_HOSTS_LIST=6
 readonly EXIT_HOSTS_DEAD=7
@@ -24,15 +24,36 @@ readonly EXIT_CONNECTION=8
 
 print_usage()
 {
-  echo "Usage:"
-  echo "  $0 [-P] [-r|-R] [-l login] <hosts_list> <file1> [file2 [...]]"
-  echo
-  echo "Options:"
-  echo "  -P: transfer files in parallel instead of one by one if possible"
-  echo "      (ignored when -r or -R is used)."
-  echo "  -r: use prsync instead of pscp."
-  echo "  -R: use prsync with option --delete (delete remote files that are"
-  echo "      not in the local copy)."
+  cat <<EOF
+Usage:
+  $0 [-P] [-r|-R] [-l login] <hosts_list> <file1> [file2 [...]]
+
+Options:
+  -h  Print this help message.
+  -P  Transfer files in parallel instead of one by one whenever possible
+      (ignored when -r or -R is used).
+  -r  Use prsync instead of pscp.
+  -R  Use prsync's --delete option (delete remote files that are not in
+      the local copy).
+EOF
+}
+
+bad_usage()
+{
+  err "$@"
+  echo >&2
+  print_usage >&2
+  exit $EXIT_USAGE
+}
+
+err()
+{
+  printf 'Error! %s\n' "$@" >&2
+}
+
+warn()
+{
+  printf 'Warning! %s\n' "$@" >&2
 }
 
 # Parse the optional arguments
@@ -70,17 +91,13 @@ done
 # example with "multicopy -l root -P my_file", it will try to use
 # "-P" as hosts' list and "my_file" as the file to be transfered.
 if [ $# -lt 2 ] ; then
-  print_usage
-  exit $EXIT_USAGE
+  bad_usage "Wrong number of arguments."
 fi
 
 # Check the usage of -r and -R
 if [ "$DELETE" = "1" ] ; then
   if [ "$RSYNC" = "1" ] ; then
-    echo "Use either -r or -R, but not both!"
-    echo
-    print_usage
-    exit $EXIT_USAGE
+    bad_usage "Use either -r or -R, but not both."
   fi
   RSYNC=1
   DELETE="-X --delete"
@@ -88,7 +105,7 @@ fi
 
 # Ignore -P if rsync is going to be used
 if [ "$RSYNC" = "1" ] && [ "$PARALLEL" = "1" ] ; then
-  echo "Cannot transfer in parallel when using rsync: ignoring -P."
+  warn "Cannot transfer in parallel when using rsync: ignoring -P."
   PARALLEL=""
 fi
 
@@ -97,16 +114,16 @@ PSCP=$(command -v parallel-scp || command -v pscp.pssh || command -v pscp)
 PRSYNC=$(command -v parallel-rsync || command -v prsync)
 MULTIPING=$(command -v multiping)
 if [ -z "$RSYNC" ] && [ -z "$PSCP" ] ; then
-  echo "Parallel SSH (pssh) is required for this script to work."
+  err "Parallel SSH (pssh) is required for this script to work."
   exit $EXIT_DEPENDENCY
 fi
 if [ -z "$PRSYNC" ] ; then
-  echo "Parallel rsync (prsync) is required for this script to work."
+  err "Parallel rsync (prsync) is required for this script to work."
   exit $EXIT_DEPENDENCY
 fi
 if [ -z "$MULTIPING" ] ; then
-  echo "multiping (which should have been provided along with this"
-  echo "script) is required for this script to work."
+  err "multiping (which should have been provided along with this" \
+      "script) is required for this script to work."
   exit $EXIT_DEPENDENCY
 fi
 
@@ -119,7 +136,7 @@ HOSTS="$XDG_CONFIG_HOME/ssh_tools/${HOSTS_LIST_NAME}.lst"
 shift
 echo "Using file '$HOSTS' as hosts' list."
 if [ ! -f "$HOSTS" ] ; then
-  echo "The hosts' list file doesn't exist or is not a regular file."
+  err "The hosts' list file doesn't exist or is not a regular file."
   exit $EXIT_HOSTS_LIST
 fi
 
@@ -135,13 +152,13 @@ fi
 FIRST_HOST=$($MULTIPING "$HOSTS_LIST_NAME" 2>/dev/null \
            | sed -n "s/ is alive$//p" | head -n1)
 if [ -z "$FIRST_HOST" ] ; then
-  echo "None of the remote hosts is alive."
+  err "None of the remote hosts is alive."
   exit $EXIT_HOSTS_DEAD
 fi
 echo "Testing connection to $FIRST_HOST..."
 DEST_DIR="$(ssh "${SSH_LOGIN}${FIRST_HOST}" 'echo $HOME' 2>/dev/null)"
 if [ -z "$DEST_DIR" ] ; then
-  echo "Cannot connect to the first alive host. Aborting."
+  err "Cannot connect to the first alive host. Aborting."
   exit $EXIT_CONNECTION
 fi
 echo "Destination directory: $DEST_DIR"
@@ -156,7 +173,7 @@ fi
 for FILE in "$@" ; do
   echo "Deploying '$FILE'..."
   if [ ! -e "$FILE" ] ; then
-    echo "This file doesn't exist, skipping."
+    warn "This file doesn't exist, skipping."
     continue
   fi
   if [ "$RSYNC" = "1" ] ; then