add solutions

zz-solutions/03-DigitalToAnalogConverter/Scripts/generateSSHKey.bash

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+#!/bin/bash
+
+#==============================================================================
+# generates an SSH key under default user location ~/.ssh/
+# and add the public key to the clipboard
+#
+# the email could be given when calling the script or be prompted later
+
+email=''
+filename=$(hostname)
+user=$(whoami)
+
+usage='Usage: generateSSH.bash [-e email]'
+
+# handle options
+while getopts 'e:v' flag; do
+  case "${flag}" in
+    e) email=${OPTARG};;
+  esac
+done
+
+# if the mail is not given, prompt it
+if [ -z "$email" ]
+then
+      echo -n "Please enter your mail: "
+      read email
+fi
+# generates the key-couple
+# cat /dev/zero create an empty file to be filled by the key
+# then ssh-keygen is called with:
+# -q to call it silently (no verbose)
+# -N with empty string to set no-password
+# -t to specify the type of key
+# -C to set the user mail
+cat /dev/zero | ssh-keygen -q -N "" -t ed25519 -C "${user}@${filename}" -f ~/.ssh/$filename
+
+# then copy the public key into the clipboard
+clip < ~/.ssh/${filename}.pub
+
+# print output for user
+echo -e "\nThe keyfiles are generated under ~/.ssh/"
+echo -e "\nThe public key is in your clipboard, ready to be added to your Github account."