option errors show usage

README.md

@@ -1,4 +1,4 @@
-pb ![calver](https://img.shields.io/badge/calver-2020.01.20-22bfda.svg?style=flat-square) ![status](https://img.shields.io/badge/status-working-green.svg?style=flat-square) ![license](https://img.shields.io/badge/license-GPL3-blue.svg?style=flat-square)
+pb ![calver](https://img.shields.io/badge/calver-2020.06.10-22bfda.svg?style=flat-square) ![status](https://img.shields.io/badge/status-working-green.svg?style=flat-square) ![license](https://img.shields.io/badge/license-GPL3-blue.svg?style=flat-square)
 ------
 
 **pb** is a helper utility for using 0x0 pastebin services

pb

@@ -1,9 +1,9 @@
 #!/bin/sh
 
 # init variables
-version="v2020.01.20"
+version="v2020.06.10"
 ENDPOINT="https://ttm.sh"
-flag_options="hvcufs::x"
+flag_options=":hvcufs::x"
 flag_version=0
 flag_help=0
 flag_file=0
@@ -31,6 +31,12 @@ OPTIONAL FLAGS:
 END
 }
 
+show_usage() {
+  cat > /dev/stdout << END
+usage: pb [-hfvcux] [-s server_address] filename
+END
+}
+
 # helper for program exit, supports error codes and messages
 die () {
   msg="$1"
@@ -59,14 +65,16 @@ fi
 
 # attempt to parse options or die
 if ! parsed=$(getopt ${flag_options} "$@"); then
-  die "Invalid input" 2
+  printf "pb: unknown option\\n"
+  show_usage
+  exit 2
 fi
 
 # handle options
 eval set -- "${parsed}"
 while true; do
   case "$1" in
-    -h)
+    -h|?)
       flag_help=1
       ;;
     -v)

pb.1

@@ -1,4 +1,4 @@
-.TH PB 1 "20 January 2020" "v2020.01.20"
+.TH PB 1 "10 June 2020" "v2020.06.10"
 
 .SH NAME
 pb \- a helper utility for using 0x0 pastebin services