我试图在cron运行的bash脚本中使用scp（我在Ubuntu 10.0.4 LTS上运行此脚本）。
该脚本运行良好（例如，当我从命令行运行该脚本时，将文件1和文件2传输到远程服务器并从远程服务器复制文件1和文件2。但是，当我将脚本作为cron作业运行时，它会失败。
脚本如下所示：
#!/bin/bash
cd /home/oompah/scripts/tests/
scp -P 12345 file1 oompah@someserver.com:~/uploads
if scp -P 12345 oompah@someserver.com:/path/to/file2.dat local.dat >&/dev/null ; then
echo "INFO: transfer OK" ;
else
echo "ERROR: transfer failed" ;
fi当我将其作为cron作业运行时，收到的错误消息（重定向到日志文件）是：
ERROR: transfer failed我发送到我的邮件收件箱的错误消息是：
Permission denied (publickey).
lost connection为什么会发生，如何解决？
[编辑]
我用-i命令（如M Jenkins的建议）修改了第一个scp命令，还为调试消息添加了-v。这是完整的调试消息日志。希望它可以阐明正在发生的事情：
Executing: program /usr/bin/ssh host 12.34.56.78, user oompah, command scp -v -t ~/uploads
OpenSSH_5.3p1 Debian-3ubuntu6, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 12.34.56.78 [12.34.56.78] port 12345.
debug1: Connection established.
debug1: identity file /home/oompah/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3p1 Debian-3ubuntu3
debug1: match: OpenSSH_5.3p1 Debian-3ubuntu3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu6
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '[12.34.56.78]:12345' is known and matches the RSA host key.
debug1: Found key in /home/oompah/.ssh/known_hosts:3
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/oompah/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 277
debug1: PEM_read_PrivateKey failed
debug1: read PEM private key done: type <unknown>
debug1: read_passphrase: can't open /dev/tty: No such device or address
debug1: No more authentication methods to try.
Permission denied (publickey).
lost connection
Permission denied (publickey).
3
如果不将stdout和stderr重定向到/ dev / null，会得到什么输出？
—
bmk
@bmk：如果没有stdout重定向，我会收到以下消息：权限被拒绝（公钥）。失去连接权限被拒绝（公钥）。
—
oompahloompah”，2011年
建议：切勿在此类脚本中丢弃stderr。它比仅显示一条“ ERROR”消息更有用。
—
grawity 2011年
可能是a。）在交互式运行命令时使用代理，b。）在没有自己的密钥对（或主文件夹）的情况下以其他用户身份运行该代理，或c。）目标上的authenticated_keys限制了代理的来源连接...？
—
0xC0000022L