refactor(posix): replace echo bashisms with printf (fixes #479, SC3037)

_webi/template.sh

@@ -118,9 +118,9 @@ __bootstrap_webi() {
             # but that's okay, 'cmp -s' is good enough for us
             if cmp -s "${pkg_src_cmd}" "${my_current_cmd}"; then
                 echo "${my_canonical_name} already installed:"
-                echo -n "    ${pkg_dst}"
+                printf "    %s" "${pkg_dst}"
                 if [ "${pkg_src_cmd}" != "${my_current_cmd}" ]; then
-                    echo -n " => ${pkg_src}"
+                    printf " => %s" "${pkg_src}"
                 fi
                 echo ""
                 exit 0
@@ -345,7 +345,7 @@ __bootstrap_webi() {
     __init_installer() {
 
         # do nothing - to satisfy parser prior to templating
-        echo -n ""
+        printf ""
 
         # {{ installer }}
 

git-config-gpg/git-config-gpg.sh

@@ -17,11 +17,11 @@ __git_gpg_init() {
         gpg-pubkey-id
     )"
 
-    echo -n "Enabling automatic git commit signing...
-	    git config --global user.signingkey ${MY_KEY_ID}
+    printf "Enabling automatic git commit signing...
+	    git config --global user.signingkey %s
 	    git config --global commit.gpgsign true
 	    git config --global log.showSignature true
-	"
+	" "${MY_KEY_ID}"
 
     git config --global user.signingkey "${MY_KEY_ID}"
     git config --global commit.gpgsign true

gpg-pubkey/gpg-pubkey.sh

@@ -70,7 +70,7 @@ _create_gpg_key() {
         echo >&2 "Choose a passphrase for this GPG Key."
         echo >&2 "(the passphrase will not be shown as you type)"
         echo >&2 ""
-        echo >&2 -n "Passphrase: "
+        printf >&2 "Passphrase: "
         MY_REPLY="$(__shadow_read)"
         echo >&2 ""
         echo "