Fix unbound variable errors

seqs/ebackup.sh

@@ -59,9 +59,9 @@ step_1() {
     return 1
   fi
 
-  if [ ! -z "$1" ] && ( [ "$1" == "full" ] || [ "$1" == "incremental" ] ) ; then
+  if [ -n "${1:-}" ] && ( [ "$1" == "full" ] || [ "$1" == "incremental" ] ) ; then
     dupArgs+=("$1")
-  elif [ ! -z "$1" ] ; then
+  elif [ -n "${1:-}" ] ; then
     echo " [W] $toolName command \"$1\" not recognized"
     return 1
   fi
@@ -155,7 +155,7 @@ step_7() {
   shift
   local ebuTarget="$EBU_TARGET"
   local dupCommand=
-  if [ ! -z "$1" ] ; then
+  if [ -n "${1:-}" ] ; then
     ebuTarget="$1"
   fi
 
@@ -182,7 +182,7 @@ step_20_info() {
   [ ! -z "${1:-}" ] && ebuTarget="$1"
   if contextHelp; then
     echo "Status of (profile) [TARGET]"
-  elif [ ! -z "$1" ]; then
+  elif [ -n "${1:-}" ]; then
     echo "Status of target: $ebuTarget"
   else
     echo "Status of profile \"$seq_profileName\" target: $ebuTarget"
@@ -192,7 +192,7 @@ step_20_alias() { echo 'status'; }
 step_20() {
   shift
   local ebuTarget="$EBU_TARGET"
-  if [ ! -z "$1" ] ; then
+  if [ -n "${1:-}" ] ; then
     ebuTarget="$1"
   fi
 
@@ -205,7 +205,7 @@ step_22_alias() { echo 'list'; }
 step_22() {
   shift
   local ebuTarget="$EBU_TARGET"
-  if [ ! -z "$1" ] ; then
+  if [ -n "${1:-}" ] ; then
     ebuTarget="$1"
   fi