sshput - copy an ssh id into the authorized keys on a remote machine

sshput

#!/bin/sh
# sshput <remotehost>
#
# Puts your local DSA public key into the .ssh/authorized_keys 
# on a remote machine.  This should allow you to login without
# needing a password.
#
# This software comes with no guarantees whatsoever, and is yours to 
# do with as you will. I'd be grateful if you feed any generally-useful 
# improvements back to me, for the benefit of others.
#
#                Quentin Stafford-Fraser  http://www.qandr.org/quentin

PUBKEY="${HOME}/.ssh/id_dsa.pub"

if [ $# -ne 1 -o "$1" = "-h" ]
then
    echo
    echo Syntax:
    echo "$0 [user@]<remotehost>"
    echo
    exit 1
fi

if [ ! -r ${PUBKEY} ]
then
    echo
    echo Public key ${PUBKEY} not found.
    echo You can generate this by running
    echo "  ssh-keygen -t dsa"
    echo Then come back and run $0 again.
    echo
    exit 1
fi

echo If you are prompted for a password, enter your password on the
echo remote machine.

cat ${HOME}/.ssh/id_dsa.pub | \
  ssh $1 'mkdir -p -m 0700 ${HOME}/.ssh && \
    cat >> $HOME/.ssh/authorized_keys && \
    chmod 0600 $HOME/.ssh/authorized_keys'

if [ $? -eq 0 ]
then
    echo Public key installed on remote machine.
    echo You should now be able to connect with
    echo "    ssh $1"
    exit 0
else
    echo Sorry, an error occurred!
    exit 1
fi