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Compare a remote file with a local file

Terminal - Compare a remote file with a local file
ssh [email protected] cat /path/to/remotefile | diff /path/to/localfile -
2009-02-04 11:33:19
User: root
Functions: cat diff ssh
159
Compare a remote file with a local file

Useful for checking if there are differences between local and remote files.

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
vimdiff <file> scp://[<user>@]<host>/<file>
diff <(ssh [email protected] cat /path/to/remotefile) /path/to/localfile
vimdiff scp://[user@]host1/<file> scp://[user@]host2/<file>
2009-07-08 22:39:36
User: Tekhne
1

A little messy, but functional. Requires vim >= 7.x.

test "$(md5sum /local/file | cut -d' ' -f1)" == "$(ssh [email protected] -- md5sum /remote/file | cut -d' ' -f1)" && echo "Match" || echo "Differ"
2015-04-24 03:09:33
User: gnif
Functions: echo test
1

This method does not transfer the contents of the entire file, instead it computes a md5 sum of the file on each end so that large files can be compared without transferring them across the net.

diff <(ssh $remote_site cat $file) $file
2015-05-09 11:11:56
User: hal8
Functions: cat diff ssh
0

opens the output of some command as a file so this also works with graphical editors like meld, kdiff3 etc

meld <(ssh $remote_site cat .zshrc) .zshrc

Know a better way?

If you can do better, submit your command here.

What others think

These commands all require transferring the entire file to the local computer, if the file is large or you are on a slow link this command is very slow. I have posted an alternative that computes the md5sum instead but it has yet to be approved.

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Comment by xiaozhengm 30 weeks and 1 day ago

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