chore: drop useless echo usage

Author: SirRGB

scripts/compat.sh

@@ -26,7 +26,7 @@ _setup_jdk8() {
     --header 'X-GitHub-Api-Version: 2022-11-28' \
     https://api.github.com/repos/adoptium/temurin8-binaries/releases/latest \
     | jq .tag_name)
-  jdk_name=OpenJDK8U-jdk_x64_linux_hotspot_$(echo "${jdk_tag//jdk/}" | tr -d '-').tar.gz
+  jdk_name=OpenJDK8U-jdk_x64_linux_hotspot_$(tr -d '-' <<< "${jdk_tag//jdk/}").tar.gz
   mkdir --parents "${jdk_dir}"
   curl_cmd --remote-name https://github.com/adoptium/temurin8-binaries/releases/download/"${jdk_tag}"/"${jdk_name}" --output-dir "${jdk_dir}"
   curl_cmd https://github.com/adoptium/temurin8-binaries/releases/download/"${jdk_tag}"/"${jdk_name}".sha256.txt | sed "s|${jdk_name}|${jdk_dir}/${jdk_name}|g" | sha256sum --check

scripts/sync.sh

@@ -52,9 +52,9 @@ _merge_local_manifests() {
 # Clone a repo
 _clone() {
   full_repo_name="${1}"
-  repo_name=$(echo "${full_repo_name}" | rev | cut -d'/' -f3- | rev)
-  branch=$(echo "${full_repo_name}" | rev | cut -d'/' -f-1 | rev)
-  target_path=$(echo "${full_repo_name}" | rev | cut -d'/' -f3 | rev | sed 's/android_//g; s/proprietary_//g; s|_|/|g')
+  repo_name=$(rev <<< "${full_repo_name}" | cut -d'/' -f3- | rev)
+  branch=$(rev <<< "${full_repo_name}" | cut -d'/' -f-1 | rev)
+  target_path=$(rev <<< "${full_repo_name}" | cut -d'/' -f3 | rev | sed 's/android_//g; s/proprietary_//g; s|_|/|g')
   rm -rf "${target_path}" || true
   git clone "${repo_name}" -b "${branch}" "${target_path}"
 }