Update 'install.sh'

install.sh

@@ -1,28 +1,51 @@
 #!/bin/bash
 
 function show_help {
-  echo "This is the help"
+  echo "Usage: install.sh [cmd] [ -y | --yes ] [ -h | --help ] [ -m | --arch ARCH-STRING ] [ -d | --debug ]
+                                [ -d | --delta   DELTA   ] filename(s)"
+  echo "Available commands:
+        update
+        install"
+  exit 2
 }
 
+PARSED_ARGUMENTS=$(getopt -a -n install.sh -o hvyi:acrbm:p --long yes,help,debug,arch: -- "$@")
+VALID_ARGUMENTS=$?
+if [ "$VALID_ARGUMENTS" != "0" ]; then
+  usage
+fi
+
 ARCH=$(/usr/bin/dpkg --print-architecture)
 
-while getopts "h?vyi:acrbm:p" opt; do
-  case "$opt" in
-    h|\?)      show_help;      exit 0      ;;
-    v)      P_Verbose=1      ;;
-    d)      P_Debug=1      ;;
-    y)      P_Yes=1      ;;
-    p)      P_APT=1; P_DEB=1   ;;
-    c)      P_CONFIG=1      ;;
-    r)      P_RC=1      ;;
-    b)      P_BINARY=1      ;;
-    i)      P_Install=$OPTARG      ;;
-    m)      ARCH=$OPTARG      ;;
-    z)      P_ZSH=1 ;;
-    a)      P_APT=1; P_DEB=1; P_CONFIG=1; P_RC=1; P_BINARY=1; P_ZSH=1 ;;
+echo "PARSED_ARGUMENTS is $PARSED_ARGUMENTS"
+eval set -- "$PARSED_ARGUMENTS"
+while :
+do
+  case "$1" in
+    -h | --help)    show_help ;;
+    -v)             P_Verbose=1   ; shift ;;
+    -d | --debug)   P_Debug=1     ; shift ;;
+    -y)             P_Yes=1       ; shift ;;
+    -p)             P_APT=1; P_DEB=1  ; shift ;;
+    -c)             P_CONFIG=1    ; shift ;;
+    -r)             P_RC=1        ; shift ;;
+    -b)             P_BINARY=1    ; shift ;;
+    -i)             P_Install="$2"; shift 2 ;;
+    -m | --arch)    ARCH="$2"     ; shift 2 ;;
+    -z)             P_ZSH=1       ; shift ;;
+    -a)             P_APT=1; P_DEB=1; P_CONFIG=1; P_RC=1; P_BINARY=1; P_ZSH=1; shift ;;
+    # -- means the end of the arguments; drop this, and break out of the while loop
+    --) shift; break ;;
+    # If invalid options were passed, then getopt should have reported an error,
+    # which we checked as VALID_ARGUMENTS when getopt was called...
+    *) echo "Unexpected option: $1 - this should not happen."
+       usage ;;
   esac
 done
 
+echo "Parameters remaining are: $@"
+
+
 ASK="\e[34m"
 INFO="\e[91m\e[1m"
 ADD="\e[32m\e[1m"