我可以在unix中了解scp命令的退出状态吗？

Question

用scp命令在perl中编程时 面对scp命令的退出状态我很困惑
如果你知道哪个退出值（除了0成功，1个错误）是为了我的生活将是简单的

Answer 1

来自here：

0   Operation was successful
1   General error in file copy
2   Destination is not directory, but it should be
3   Maximum symlink level exceeded
4   Connecting to host failed.
5   Connection broken
6   File does not exist
7   No permission to access file.
8   General error in sftp protocol
9   File transfer protocol mismatch
10  No file matches a given criteria
65  Host not allowed to connect
66  General error in ssh protocol
67  Key exchange failed
68  Reserved
69  MAC error
70  Compression error
71  Service not available
72  Protocol version not supported
73  Host key not verifiable
74  Connection failed
75  Disconnected by application
76  Too many connections
77  Authentication cancelled by user
78  No more authentication methods available
79  Invalid user name

Answer 2

link：scp return codes

Answer 3

在处理shell命令和类似程序时，

0几乎总是成功返回代码。