Add calc.sh

calc.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+OPERADORES_DISPONIBLES=("+" "x" "-" "/")
+VALID=false
+FINAL_SEQUENCE=""
+RE='^[0-9]+$'
+NG='^-[0-9]+$'
+
+for arg in $@; do
+  valid_num=false
+  valid_oper=false
+
+  for oper in "${OPERADORES_DISPONIBLES[@]}"; do
+    if [[ "$oper" == "$arg" ]] ; then
+      valid_oper=true
+    fi
+  done
+
+  if [[ $arg =~ $RE || $arg =~ $NG ]] ; then
+    valid_num=true
+  fi
+
+  if [[ "$valid_num" != true && "$valid_oper" != true ]] ; then
+    echo "INVALID CHARACTER DETECTED: $arg"
+    exit
+  fi
+
+  if [[ $arg == "x" ]]; then
+    FINAL_SEQUENCE+="* "
+  else
+    FINAL_SEQUENCE+="$arg "
+  fi
+done
+#echo "$FINAL_SEQUENCE"
+echo "$FINAL_SEQUENCE = $(($FINAL_SEQUENCE))"