diff --git a/README.md b/README.md
index 97d5231..13c0021 100644
--- a/README.md
+++ b/README.md
@@ -1,21 +1,24 @@
 # wled.sh
 
-Simple shell script to turn predefined wled instances on/off, change brightness
-and switch presets.
-
-Requires *curl* version 7.82.0 or newer.
+Turn WLED installations in the C4 hackspace on/off, change brightness or switch
+between presets.
 
 ## Usage
 
 Switch on/off:
 
-`wled f(nordcenter)|w(ohnzimmer) on|off`
+`$ wled -f(nordcenter)|-w(wohnzimmer) on|off`
 
 Switch between presets 1 to 17 or list available presets:
 
-`wled f(nordcenter)|w(ohnzimmer) 1-17|l(ist)`
+`$ wled -f|-w 1-17|l`
 
 Change brightness:
 
-`wled f(nordcenter)|w(ohnzimmer) b(rightness) 1-255`
+`$ wled -f|-w -b 1-255`
+
+## Requirements
+
+*curl* version 7.82.0 or newer.
+You have to be connected to the local network.
 
diff --git a/wled b/wled
index 946d282..49aff8e 100755
--- a/wled
+++ b/wled
@@ -1,28 +1,54 @@
 #!/bin/sh
 #
-# Simpel command line tool to turn predefined wled instances on/off or switch
-# presets.
+# Turn WLED installations in the C4 hackspace on/off, change brightness or
+# switch between presets.
 #
 # Author: Shy
 # License: CC0
 
-CURL_FLAGS="--silent --show-error --fail --ipv4 --max-filesize 64K"
+NAME="wled.sh"
+COMMAND="wled"
+VERSION="0.0.1"
 
 print_usage() {
-    echo "Usage: $0 f(nordcenter)|w(ohnzimmer) on|off|1-17|list"
-    echo "       $0 f(nordcenter)|w(ohnzimmer) b(rightness) [1-255]"
+    echo "\
+Usage: $COMMAND -f(norcenter)|-w(wohnzimmer) [on|off]
+       $COMMAND -f|-w [1-17|list]
+       $COMMAND -f|-w -b [1-255]"
+}
+
+print_help() {
+    print_usage
+    echo "
+host selection:
+    -f,--fnordcenter        select fnordcenter
+    -w,--wohnzimmer         select wohnzimmer
+
+commands:
+    on|off                  switch on/off
+    [1-17]                  switch preset
+    l, list                 list presets
+    -b,--brightness [1-255] set brightness"
+}
+
+curl_cmd() {
+    curl --silent --show-error --fail --ipv4 --max-filesize 32K "$@"
 }
 
 # Parse host argument.
 case "$1" in
-    ""|-h|--h) # Missing host parameter.
-        print_usage
+    ""|-h|--help) # Missing host parameter.
+        print_help
         exit 0
     ;;
-    f|fnordcenter)
+    -v|--version)
+        echo "$NAME version $VERSION"
+        exit 0
+    ;;
+    -f|--fnordcenter)
         wled_host='wled-fnordcenter.local'
     ;;
-    w|wohnzimmer)
+    -w|--wohnzimmer)
         wled_host='wled-wohnzimmer.local'
     ;;
     *) # Unknown host parameter.
@@ -35,12 +61,12 @@ esac
 # Parse and execute command argument.
 case "$2" in
     on) # Switch on.
-        api_resp=$(curl $CURL_FLAGS --json '{"on":true}' "http://$wled_host/json")
+        api_resp=$(curl_cmd --json '{"on":true}' "http://$wled_host/json")
     ;;
     off) # Switch off.
-        api_resp=$(curl $CURL_FLAGS --json '{"on":false}' "http://$wled_host/json")
+        api_resp=$(curl_cmd --json '{"on":false}' "http://$wled_host/json")
     ;;
-    b|brightness) # Set brightness.
+    -b|--brightness) # Set brightness.
         if test -z "$3"; then
             echo "Error: missing parameter for brightness." >&2
             exit 1
@@ -54,22 +80,24 @@ case "$2" in
             echo "Error: parameter for brightness is out of range." >&2
             exit 1
         fi
-        api_resp=$(curl $CURL_FLAGS --json "{'bri':$bright}" "http://$wled_host/json")
+        api_resp=$(curl_cmd --json "{'bri':$bright}" "http://$wled_host/json")
     ;;
     [1-9]|1[0-7]) # Switch to preset.
-        api_resp=$(curl $CURL_FLAGS --json "{'on':true,'ps':$2}" "http://$wled_host/json")
+        api_resp=$(curl_cmd --json "{'ps':$2}" "http://$wled_host/json")
     ;;
     l|list) # List presets.
-        echo "Presets on $wled_host:"
-        curl $CURL_FLAGS "http://$wled_host/presets.json" | \
+        printf "loading ...\r"
+        curl_cmd "http://$wled_host/presets.json" | \
             # Split into lines - one line per preset. Append final newline.
-            sed --sandbox 's/"\(1\?[0-9]\)"/\n"\1"/g; $a\' | \
-            # Extract number and name of every preset.
-            sed --sandbox -n 's/^"\(1\?[0-9]\)":.*"n":"\([[:print:]]*\)".*$/\1: \2/p'
+            sed --sandbox 's/"\(1\?[0-9]\)"[[:space:]]*:/\n&/g; $a\ ' | \
+            # Extract number and name of every preset. Prepend description.
+            sed --sandbox -n \
+                -e 's/^"\(1\?[0-9]\)"[[:space:]]*:.*"n"[[:space:]]*:[[:space:]]*"\([[:print:]]*\)".*$/\1: \2/p' \
+                -e "1i\\Presets on $wled_host:"
         exit $?
     ;;
     dump) # Dump JSON response from API.
-        curl $CURL_FLAGS -w '\n' "http://$wled_host/json"
+        curl_cmd -w '\n' "http://$wled_host/json"
         exit 0
     ;;
     "") # Missing command.
@@ -84,14 +112,15 @@ case "$2" in
     ;;
 esac
 
+# Check curl exit status
 curl_exit=$?
 if test $curl_exit -ne 0; then
     echo "Error: curl exited with exit code $curl_exit." >&2
     exit 1
 fi
 
-# Check API responce. Should be {"success":true}.
-if test "$(echo -n "$api_resp"|tr -c -d '[:alpha:]')" != 'successtrue'; then
+# Check API responce.
+if echo "$api_resp" | grep -qv '{\s*"success"\s*:\s*true\s*}'; then
     echo "Error: unexpected responce from WLED API." >&2
     exit 1
 fi