FAS Computer Services to Harvard University IT: (617) 495-7777.
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The file server at the
Mathematics department
has the ability to recover user files that were mistakenly deleted or to
retrieve older versions of files you have been working on.
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A new facility called "snapshots" keep images of every
file and directory as it existed at a specific instance in time over
several of the preceding hours, days, and weeks.
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To recover a specific file (or an entire directory or directory tree, should
it become necessary), cd to the directory that contained the file/s you
want to recover.
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Type
cd .snapshot
in the directory you lost a file.
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Under the .snapshot pseudo-directory you will see directories that look like:
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hourly.0/ hourly.3/ nightly.0/ nightly.3/ weekly.0/ weekly.3/
hourly.1/ hourly.4/ nightly.1/ nightly.4/ weekly.1/
hourly.2/ hourly.5/ nightly.2/ nightly.5/ weekly.2/
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These directories are "snapshots" of the current directory (and its
subdirectories) as it existed 0 to 5 hours ago (on the hour) 0 to 5 nights
ago (at midnight) and 0 to 3 weeks ago (at midnight on Sunday). Use the
command "ls -lu" (not just "ls -l") to get the date and time of the
particular snapshot. The "ls -l" info on the files within the snapshot
directories is correct.
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Just cd into the directory you want and cp the file/s you need back to
your regular directory. The snapshot directories themselves are read-only
so you can't change or edit anything within them.
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NOTE: This snapshot facility is not available for email in your Inbox
(which is delivered on a different server) though it would be available
for any email you save as a separate file in folders, etc.
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Please contact Arthur Gaer for
any questions in this respect.
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