Create eg_math.sh

BashExample/eg_math.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# Commonly used commands with this file:
+# bash --version
+# cat eg_math.sh
+# bash eg_math.sh
+
+x=10
+y=5
+
+echo x=$x, y=$y
+echo $x+$y=$((x+y))
+echo $x-$y=$((x-y))
+echo $x*$y=$((x*y))
+echo $x/$y=$((x/y))
+
+x=11
+echo  # print a empty line
+echo 'New value for x'
+echo x=$x, y=$y
+# Perform division with Bash and bc
+echo 'With Bash:' $((x/y))
+echo -n 'With bc and scale set to 2: '
+echo "scale=2; $x/$y" | bc
+
+echo
+echo -n 'Adding x and y with expression (expr): '
+expr $x + $y
+let "sum = $x + $y"
+echo 'x + y =' $sum