piping added and resolved the conflicts

pert

@@ -67,7 +67,8 @@ function pert_table
     total_estimate=0
     total_standard_deviation=0
     total_variance=0
-    for var in "$@"; do
+    time=("$@")
+    for var in "${time[@]}"; do
 
         # counter iterator
         counter=$[$counter +1]
@@ -146,18 +147,24 @@ function pert_table
 
 
 # main
-if [ $# -eq 0 ]; then
+if [ ! -t 0 ];then
+    time=$(cat -)
+    pert_table ${time[@]}
+else
+    if [ $# -eq 0 ]; then
         _help
         exit 1
-fi
+    fi
 
-case "$1" in
+    case "$1" in
       *help|*h)
         _help
         exit 1
         ;;
       *)
+
         pert_table $@
         exit 0
         ;;
-esac
+    esac
+fi