Script for create and append SSH key in a remote server

ssh-key.sh

#!/bin/sh

FKEY="$HOME/.ssh/id_rsa"
FPUB="$FKEY.pub"

if [ ! -f "$FPUB" ]; then
	echo 'Type your email, followed by [ENTER]:'
	read COMMENT

	ssh-keygen -t rsa -N '' -C "$COMMENT" -f "$FKEY"
fi


TPARENT="/tmp/$(basename $0)-$$"
TDIR="$TPARENT/.ssh"

mkdir -p "$TDIR"
if [ $? -ne 0 ]; then
	echo 'fatal';
	exit
fi

TFILE="$TDIR/authorized_keys"


echo 'Type user of server, followed by [ENTER]:'
read SUSER

echo 'Type host of server, followed by [ENTER]:'
read SHOST


scp "$SUSER@$SHOST:~/.ssh/authorized_keys" "$TFILE"
if [ $? -ne 0 ]; then
	touch "$TFILE"
fi


cat "$FPUB" >> "$TFILE"


scp -r "$TPARENT/." "$SUSER@$SHOST:~/"


rm "$TFILE"
rmdir "$TDIR"
rmdir "$TPARENT"