add bash autograder

Bash-arith/README.md

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+# Bash Arithmetic Lab
+Make a shell script that performs * operations with the flags -a -b,
+i.e.
+```
+./math -a 1 -b 2 
+>>> 2
+./math -a 4 -b 8
+>>> 32
+```
+
+## Assesment Language
+Bash
+
+## Autograder Language
+Python
+
+## Autograding Environment Packages
+Python3
+
+## Hand-in Format 
+`math.sh`
+
+

Bash-arith/autograde-Makefile

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+all:
+		tar xvf autograde.tar
+		tar xvf handin.tar
+		cp math.sh test_autograder
+
+		(cd test_autograder; python3 driver.py)
+
+clean:
+		rm -rf *~ test_autograder

Bash-arith/math.sh

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+#!/usr/bin/bash
+
+while getopts a:b: flag
+do
+    case "${flag}" in
+        a) X=${OPTARG};;
+        b) Y=${OPTARG};;
+    esac
+done
+
+echo $((X * Y))
+

Bash-arith/refsol/math.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/bash
+
+while getopts a:b: flag
+do
+    case "${flag}" in
+        a) X=${OPTARG};;
+        b) Y=${OPTARG};;
+    esac
+done
+
+echo $((X * Y))
+

Bash-arith/test_autograder/tests.py

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+tests = [
+    ["Basic", [1, 2, 2]],
+    ["Zero", [0, 4, 0]],
+    ["Identity", [1, 8, 8]],
+    ["Large", [123456789, 2, 246913578]]
+]