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TMPFILE=$(mktemp)
# cleanup old agent-sockets
if [ -r "${HOME}/.ssh-agent-forwarding" ]; then
cut -d" " -f2 "${HOME}/.ssh-agent-forwarding" | \
xargs ls -a 2>/dev/null | \
grep -f - "${HOME}/.ssh-agent-forwarding" | \
sort -n > "${TMPFILE}"
mv "${TMPFILE}" "${HOME}/.ssh-agent-forwarding"
fi
# if this login is via ssh and ssh-agent is forwarded
if [ -n "$SSH_AUTH_SOCK" -a -n "$SSH_CLIENT" ]; then
# add current socket
echo "$(date +%s) $SSH_AUTH_SOCK $SSH_CLIENT" >> "${HOME}/.ssh-agent-forwarding"
ln -sf "$SSH_AUTH_SOCK" "${HOME}/.ssh-agent-forwarded-sock"
fi
SSH_AUTH_SOCK="${HOME}/.ssh-agent-forwarded-sock"
export SSH_AUTH_SOCK
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