Linux diff命令比较不同服务器上的文件--Unix
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Diff command to compare files on different servers--Unix
提问by Anusha Pachunuri
Can I use the diff command to compare files on two different servers? If not, is there any other option?
我可以使用 diff 命令来比较两个不同服务器上的文件吗？如果没有，还有其他选择吗？
采纳答案by dogbane
You can copy the file over from the other server using scpand then use diff.
您可以使用从其他服务器复制文件scp，然后使用diff.
Or sshto the remote host and diffusing a single command like this:
或者ssh到远程主机并diff使用这样的单个命令：
ssh user@remote "cat /path/to/remote/file" | diff - /path/to/local/file
回答by Corey Henderson
The "-" diffs against STDIN. You can do something like this:
“-” 与 STDIN 不同。你可以这样做：
ssh server 'cat file_to_diff' | diff -u localfile -
回答by Jeff Burdges
回答by Putnik
If you're troubleshooting AWS instance then it may make sense to stop inatanceA then attach its drive to instanceB you're want to compare with.
如果您正在对 AWS 实例进行故障排除，那么停止 inatanceA 然后将其驱动器附加到您要与之比较的 instanceB 可能是有意义的。
回答by Hastur
I know it's a late answer but I take the question literally, no local file and two remote files.
In bash(and not only) it's possible to use the process substitution[1,2] <(...):
我知道这是一个迟到的答案，但我从字面上理解这个问题，没有本地文件和两个远程文件。
在bash（不仅如此）中，可以使用进程替换[ 1, 2]<(...)：
diff <(ssh Server1 'cat /path/to/file1') <(ssh Server2 'cat /path/to/file2')
The process
<(list)is run asynchronously, and its input or output appears as a filename.
该进程
<(list)异步运行，其输入或输出显示为文件名。
Note
笔记
- Of course if you need only one remote file you can put the local file instead one of the
<(...). If both files are on the same server you can use a simpler
ssh Server1 'diff /path/to/file1 /path/to/file2'
- 当然，如果您只需要一个远程文件，您可以将本地文件放在
<(...). 如果两个文件在同一台服务器上，您可以使用更简单的
ssh Server1 'diff /path/to/file1 /path/to/file2'
