add script to speed up keygen generation

Author: clobrano

keygen.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# -*- coding: UTF-8 -*-
+## Helper script to speed up ssh keys generation for services like gitlab and github
+## options
+## -n, --name <string>      Private key name [default: id_rsa]
+## -e, --email <string>     Email to associate with the key
+# GENERATED_CODE: start
+# Default values
+_name=id_rsa
+
+# No-arguments is not allowed
+[ $# -eq 0 ] && sed -ne 's/^## \(.*\)/\1/p' $0 && exit 1
+
+# Converting long-options into short ones
+for arg in "$@"; do
+  shift
+  case "$arg" in
+"--name") set -- "$@" "-n";;
+"--email") set -- "$@" "-e";;
+  *) set -- "$@" "$arg"
+  esac
+done
+
+function print_illegal() {
+    echo Unexpected flag in command line \"$@\"
+}
+
+# Parsing flags and arguments
+while getopts 'hn:e:' OPT; do
+    case $OPT in
+        h) sed -ne 's/^## \(.*\)/\1/p' $0
+           exit 1 ;;
+        n) _name=$OPTARG ;;
+        e) _email=$OPTARG ;;
+        \?) print_illegal $@ >&2;
+            echo "---"
+            sed -ne 's/^## \(.*\)/\1/p' $0
+            exit 1
+            ;;
+    esac
+done
+# GENERATED_CODE: end
+
+set -xe
+
+cd $HOME/.ssh
+
+ssh-keygen -o -t rsa -b 4096 -C "$_email" -f $_name
+
+cd -
+
+xclip -sel clip < $HOME/.ssh/$_name.pub