[Issue 18655] New: Make the install script fully sh compliant (e.g. dash or ash)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18655

          Issue ID: 18655
           Summary: Make the install script fully sh compliant (e.g. dash
                    or ash)
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: installer
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

> sh (or the Shell Command Language) is a programming language described by the POSIX standard. It has many implementations (ksh88, dash, ...). bash can also be considered an implementation of sh (see below).

> Because sh is a specification, not an implementation, /bin/sh is a symlink (or a hard link) to an actual implementation on most POSIX systems.

https://stackoverflow.com/questions/5725296/difference-between-sh-and-bash

There's at least ash and dash that we should test for in our CI.

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