Data commit

Task/Increment-a-numerical-string/UNIX-Shell/increment-a-numerical-string-1.sh

@@ -0,0 +1,4 @@
+# All variables are strings within the shell
+# Although num look like a number, it is in fact a numerical string
+num=5
+num=`expr $num + 1`    # Increment the number

Task/Increment-a-numerical-string/UNIX-Shell/increment-a-numerical-string-2.sh

@@ -0,0 +1,7 @@
+num=5
+let num=num+1          # Increment the number
+let "num = num + 1"    # Increment again. (We can use spaces inside quotes)
+((num = num + 1))      # This time we use doublebrackets
+let num+=1             # This time we use +=
+let "num += 1"
+((num += 1))

Task/Increment-a-numerical-string/UNIX-Shell/increment-a-numerical-string-3.sh

@@ -0,0 +1,2 @@
+integer num=5          # Declare an integer...
+num=$num+1             # ...then increment without the let keyword.