trying out posix sh (#14)

* trying out posix sh

Author: dcarbone

.github/workflows/tests.yaml

@@ -42,38 +42,94 @@ jobs:
         include:
           - image: "ubuntu-latest"
             version: '1.6'
+            force: true
+          - image: "ubuntu-latest"
+            version: '1.6'
+            force: false
+          - image: "ubuntu-latest"
+            version: '1.5'
+            force: true
           - image: "ubuntu-latest"
             version: '1.5'
+            force: false
 
           - image: "ubuntu-20.04"
             version: '1.6'
+            force: true
+          - image: "ubuntu-20.04"
+            version: '1.6'
+            force: false
+          - image: "ubuntu-20.04"
+            version: '1.5'
+            force: true
           - image: "ubuntu-20.04"
             version: '1.5'
+            force: false
 
           - image: "ubuntu-22.04"
             version: '1.6'
+            force: true
+          - image: "ubuntu-22.04"
+            version: '1.6'
+            force: false
           - image: "ubuntu-22.04"
             version: '1.5'
+            force: true
+          - image: "ubuntu-22.04"
+            version: '1.5'
+            force: false
 
           - image: "ubuntu-24.04"
             version: '1.6'
+            force: true
+          - image: "ubuntu-24.04"
+            version: '1.6'
+            force: false
           - image: "ubuntu-24.04"
             version: '1.5'
+            force: true
+          - image: "ubuntu-24.04"
+            version: '1.5'
+            force: false
 
           - image: "windows-latest"
             version: '1.6'
+            force: true
+          - image: "windows-latest"
+            version: '1.6'
+            force: false
           - image: "windows-latest"
             version: '1.5'
+            force: true
+          - image: "windows-latest"
+            version: '1.5'
+            force: false
 
           - image: "windows-2019"
             version: '1.6'
+            force: true
+          - image: "windows-2019"
+            version: '1.6'
+            force: false
+          - image: "windows-2019"
+            version: '1.5'
+            force: true
           - image: "windows-2019"
             version: '1.5'
+            force: false
 
           - image: "windows-2022"
             version: '1.6'
+            force: true
+          - image: "windows-2022"
+            version: '1.6'
+            force: false
+          - image: "windows-2022"
+            version: '1.5'
+            force: true
           - image: "windows-2022"
             version: '1.5'
+            force: false
 
     name: "Test Action - (img: ${{ matrix.image }}; version: ${{ matrix.version }}; force: ${{ matrix.force }})"
     runs-on: ${{ matrix.image }}

scripts/unixish-17.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -e
 

scripts/unixish.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 set -e
 
@@ -54,7 +54,7 @@ esac
 
 # determine binary name
 
-if [[ "${_os}" == "linux" ]]; then
+if [ "${_os}" = "linux" ]; then
   case "${_arch}" in
     '386')
       _bin_name="jq-linux32"