Added usage

SSH/Create-SSH-User.bash

@@ -101,6 +101,19 @@ log() {
   esac
 }
 
+
+arg_required() {
+  echo_rgb "${1}" 255 183 0
+}
+
+arg_optional(){
+  echo_rgb "${1}" 117 255 255
+}
+
+arg_description(){
+  echo_rgb "${1}" 220 190 255
+}
+
 usage() {
   # Print out usage instructions for the local script
   #
@@ -113,14 +126,42 @@ usage() {
   # POSIX Compliant:
   #   Yes
   #
-  printf "Usage: %s\n" \
-    "$(basename ${0}) -i \"this is some input\" -t \"this is some more example input\"
-  --input <string> | -i <string>
+  printf "$(echo_rgb "Usage:" 50 220 50) %s\n" \
+"$(echo_rgb "$(basename ${0})" 180 255 180) $(arg_required "-U") <user: string> $(arg_required "-H") <hostName: string> $(arg_optional "[OPTIONS]")
+  $(arg_required "REQUIRED")
+  $(arg_optional "OPTIONAL")
+
+  $(arg_required "-U") <user: string> | $(arg_required "--user") <user: string>
+    $(arg_description \
+    "Takes in a username that is to be created on the remote host
+
     Example:
-      --input \"this is an example input\"
-  --test <string> | -t <string>
+      --user User1")
+  $(arg_required "-H") <hostName: string> | $(arg_required "--host-name") <hostName: string>
+    $(arg_description \
+    "The SSH hostname for the given host, MUST exist within your ssh configuration; typically located at ~/.ssh/config
+
     Example:
-      --test \"this is more example input\""
+      --host-name gitlab.orion-technologies.io")
+  $(arg_optional "-L") <loginUser: string> | $(arg_optional "--login-user") <loginUser: string>
+    $(arg_description \
+    "The user used to login to your host, must be a privileged sudo user. Default user is root.
+
+    Example:
+      --login-user Admin")
+  $(arg_optional "-K") <keyType: string> | $(arg_optional "--key-type") <keyType: string>
+    $(arg_description \
+    "The SSH key type to generate, passed to ssh-keygen's -t flag.
+
+    Example:
+      --key-type rsa")
+  $(arg_optional "-B") <keyBits: int> | $(arg_optional "--bits") <keyBits: int>
+    $(arg_description \
+    "The number of bits used to generate the given key, default is set at 512.
+
+    Example:
+      --bits 2048")"
+
 }
 
 ssh_user_to_create=""
@@ -169,6 +210,9 @@ parse_args() {
       [[ -z "${ssh_key_bits}" ]] &&
         log "error" "No argument provided for ${1}s" &&
         exit 1
+      [[ ! "${ssh_key_bits}" =~ [0-9] ]] &&
+        log "error" "--bits must be a whole number (int), received ${ssh_key_bits}" &&
+        exit 1
       ;;
     -H | --host-name)
       ssh_host_name="${2}"
@@ -216,7 +260,7 @@ SSH_KEY_FILE="${SSH_KEY_DIRECTORY}/${ssh_user_to_create}-${ssh_key_type}"
   exit 1
 
 log "info" "Generating SSH key file for ${ssh_user_to_create}@${ssh_host_name} at ${SSH_KEY_FILE}"
-ssh-keygen -b 512 -t ed25519 -f "${SSH_KEY_FILE}" -N "" > /dev/null 2>&1
+ssh-keygen -b 512 -t ed25519 -f "${SSH_KEY_FILE}" -N "" > /dev/null || exit "${?}"
 chmod 600 "${SSH_KEY_FILE}" > /dev/null
 log "info" "SSH key successfully created"