Update upgrade script

linux.install

@@ -1,14 +1,14 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
-_5_2_2_2_changes() {
-  echo ":: A new command line option was added: add page_alloc.shuffle=1"
+function _5_2_2_2_changes() {
+ echo ":: Update 5.2.2-2: A new command line option was added: add page_alloc.shuffle=1"
 }
 
-_5_2_9_6_changes() {
-  echo ":: Microcode is no longer builtin. See https://wiki.archlinux.org/index.php/Microcode"
+function _5_2_9_6_changes() {
+ echo ":: Update 5.2.9-6: Microcode is no longer builtin. See https://wiki.archlinux.org/index.php/Microcode"
 }
 
-post_install() {
+function post_install() {
  echo ":: Clear Linux bundles a custom command line which must be applied manually on other distributions."
  echo "  This is their default command line:"
  echo "  quiet console=tty0 console=ttyS0,115200n8 cryptomgr.notests initcall_debug"
@@ -17,15 +17,13 @@ post_install() {
  echo "  rootfstype=ext4,btrfs,xfs,f2fs tsc=reliable rw"
 }
 
-post_upgrade() {
-  local v upgrades=(
+function post_upgrade() {
+ local version upgrades=(
   5.2.2-2
   5.2.9-6
  )
 
-  for v in "${upgrades[@]}"; do
-    if [[ $(vercmp "${v}" "$2") -eq 1 ]]; then
-      "_${v//[.-]/_}_changes"
-    fi
+ for version in "${upgrades[@]}"; do
+  [[ $(vercmp "${version}" "$2") -eq 1 ]] && "_${version//[.-]/_}_changes"
  done
 }