Fix POSIX compliance: replace echo -e with printf

Author: aktech

install.sh

@@ -47,15 +47,15 @@ timestamp() {
 }
 
 info() {
-    echo -e "$(timestamp) ${GREEN}INF${NC} $1"
+    printf "%s %bINF%b %s\n" "$(timestamp)" "${GREEN}" "${NC}" "$1"
 }
 
 warn() {
-    echo -e "$(timestamp) ${YELLOW}WRN${NC} $1"
+    printf "%s %bWRN%b %s\n" "$(timestamp)" "${YELLOW}" "${NC}" "$1"
 }
 
 error() {
-    echo -e "$(timestamp) ${RED}ERR${NC} $1"
+    printf "%s %bERR%b %s\n" "$(timestamp)" "${RED}" "${NC}" "$1"
     exit 1
 }
 
@@ -188,7 +188,9 @@ parse_args() {
                 usage
                 ;;
             *)
-                error "Unknown option: $1\nRun '$0 --help' for usage"
+                printf "%s\n" "Unknown option: $1"
+                printf "%s\n" "Run '$0 --help' for usage"
+                exit 1
                 ;;
         esac
     done