some sytem scripts

shell_scripts/power_user_awk/math2.awk

@@ -0,0 +1,30 @@
+# awk -f math2
+
+BEGIN {
+  myprompt = "(To Stop press CTRL+D) > "
+  printf "Welcome to MyAddtion calculation awk program v0.1\n"
+  printf "%s" ,myprompt
+}
+
+{
+no1 = $1
+op = $2
+no2 = $3
+ans = 0
+
+if ( op == "+" )
+{
+     ans = $1 + $3
+     printf "%d %c %d = %d\n" ,no1,op,no2,ans
+     printf "%s" ,myprompt
+ }
+ else
+ {
+     printf "Opps!Error I only know how to add.\nSyntax: number1 + number2\n"
+     printf "%s" ,myprompt
+  }
+}
+
+END {
+    printf "\nGoodbye, %s\n !" , ENVIRON["USER"]
+}