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p1-sh/PHASE-3.txt

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+Answer the following questions to describe your code submission. Please keep
+all lines to a maximum of 80 characters wide.
+
+1 - Explain how you are keeping track of the return code for use in echo $?.
+
+    After each process is executed in the shell's main loop, the "?" key is
+    set to the return code of that process.
+
+2 - Briefly describe how you are storing or deleting environment variales.
+
+    Environment variables are stored directly in the hashmap. Export sets
+    the value to the corresponding key in the hashmap. Unset removes the
+    key from the hasmap. Echo finds the value in the hashmap based on the key.
+
+3 - Consider the following three command lines:
+      $ echo ${VAR}
+      $ echo {VAR}
+      $ echo ${VAR
+    Briefly explain how your code processes each. Does your code handle bad
+    input strings?
+
+    In the first case, the correct environment variable is printed.
+    In the second case the literal string {VAR} is printed.
+    In the third case nothig is printed.
+    In the first two cases the exit code of echo is 0 because they are both
+    valid inputs to echo, but the third exits with a code 1 because the
+    syntax is invalid.