refactor: Shorten variables, use Bash conditional, and update README.md

README.md

@@ -121,7 +121,7 @@ steps:
 ```
 
 ### Specific version
-You can specify the version you want.
+You can specify the version you want. By default, this action downloads the latest version.
 
 ```yaml
 steps:
@@ -131,7 +131,7 @@ steps:
       version: 0.14.0
 ```
 
-### GitHub Token
+### GitHub token
 This action automatically uses a GitHub token in order to authenticate with GitHub API and avoid rate limiting. You can also specify your own read-only fine-grained personal access token.
 
 ```yaml

scripts/download/Unix-like.sh

@@ -1,10 +1,10 @@
 #!/bin/sh
 set -eu
-if [ $RUNNER_OS = macOS ]; then restic_os=darwin; else restic_os=linux; fi
-echo ::group::Downloading Restic $version for $restic_os
-aria2c -x 16 $GITHUB_SERVER_URL/restic/restic/releases/download/v$version/restic_${version}_${restic_os}_amd64.bz2
-bzip2 -d restic_${version}_${restic_os}_amd64.bz2
+if [ $RUNNER_OS = macOS ]; then os=darwin; else os=linux; fi
+echo ::group::Downloading Restic $version for $RUNNER_OS
+aria2c -x 16 $GITHUB_SERVER_URL/restic/restic/releases/download/v$version/restic_${version}_${os}_amd64.bz2
+bzip2 -d restic_${version}_${os}_amd64.bz2
 mkdir Restic
-mv restic_${version}_${restic_os}_amd64 Restic/restic
+mv restic_${version}_${os}_amd64 Restic/restic
 chmod +x Restic/restic
 echo ::endgroup::

scripts/version/Unix-like.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 set -eu
-if [ $version == latest ]
+if [[ $version == latest ]]
 then
   latest_version=$(gh api repos/restic/restic/releases/latest -q .tag_name)
   echo version=${latest_version/v} >> $GITHUB_OUTPUT