Estimated hours taken: 0.5
Branches: main
Added a test case to ensure that stdin/out are redirected correctly when
invoking a system command.
tests/hard-coded/system_sort.m:
Test program that just calls the system command "sort".
tests/hard-coded/system_sort.inp:
Some text input.
tests/hard-coded/system_sort.exp:
Sorted output.
tests/hard-coded/Mmakefile:
Added system_sort to the enabled lists.
