Merge pull request #981 from pgierz/os_release_fix

[Bugfix] Fix for #974

functions/utilities.zsh

@@ -102,7 +102,9 @@ case $(uname) in
       ;;
     Linux)
       OS='Linux'
-      os_release_id="$(grep -E '^ID=([a-zA-Z]*)' /etc/os-release | cut -d '=' -f 2)"
+      if [ -f /etc/os-release ]; then
+        [[ ${(f)"$((</etc/os-release) 2>/dev/null)"} =~ "ID=([A-Za-z]+)" ]] && os_release_id="${match[1]}"
+      fi
       case "$os_release_id" in
         *arch*)
         OS_ICON=$(print_icon 'LINUX_ARCH_ICON')