Handle no action specified

Previously, bash would handle shifting the empty ${@} when no command
was specified, but sh should break with error "shift: nothing to shift".

Now we handle if no command is specified, by printing an error (action
required...) and returning code 1 before executing the shift.

1 files changed, 7 insertions, 3 deletions

diff --git a/andbackup.sh b/andbackup.sh
index 3bcc064..4296973 100755
--- a/andbackup.sh
+++ b/andbackup.sh
@@ -90,8 +90,6 @@ backup_app() {
   local origifs=${IFS}   # Input field seperator at runtime. Useful for
                          # reverting
 
-  local tar  # Tar command for packaging the backup
-
   # Make sure app is specified
   if [[ -z ${app} ]]; then
     lerror "Application name required."
@@ -311,7 +309,13 @@ verify_system() {
 
 
 main() {
-  local cmd=${1:-}
+  local cmd="${1:-}"
+
+  if [ -z "${cmd:-}" ]; then
+    printf "Action required (backup, listbackup, restore, listrestore)\n"
+    return 1
+  fi
+
   shift
 
   if [ "${cmd}" = 'help' ]; then