从cron使用ssh的探针

我正在尝试自动执行通过ssh在远程机器上执行命令的脚本。 我有使用ssh-agent的机器之间的公钥authentication设置。 脚本从命令提示符执行时运行正常。 我怀疑我的问题是，由于它的极简主义环境，cron没有启动ssh-agent。 下面是我向ssh添加-v标志的输出：

debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Offering public key: /home/<user>/.ssh/id_rsa debug1: Server accepts key: pkalg ssh-rsa blen 149 debug1: PEM_read_PrivateKey failed debug1: read PEM private key done: type <unknown> debug1: Trying private key: /home/<user>/.ssh/id_dsa debug1: Next authentication method: password debug1: Authentications that can continue: publickey,gssapi-with-mic,password Permission denied, please try again. debug1: Authentications that can continue: publickey,gssapi-with-mic,password Permission denied, please try again. debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: No more authentication methods to try. Permission denied (publickey,gssapi-with-mic,password). 

我怎样才能做这个工作？ 谢谢！

 PATH=$PATH:$HOME/bin SSH_ENV="$HOME/.ssh/environment" function start_agent { echo "Initialising new SSH agent..." /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}" echo succeeded chmod 600 "${SSH_ENV}" . "${SSH_ENV}" > /dev/null /usr/bin/ssh-add; } # Source SSH settings, if applicable if [ -f "${SSH_ENV}" ]; then . "${SSH_ENV}" > /dev/null #ps ${SSH_AGENT_PID} doesn't work under cywgin ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || { start_agent; } else start_agent; fi export PATH unset USERNAME