02-07-2017
Actually, I think I see the problem now. The starting value of $pref probably isn't what you think it is. The values of a 'for' loop aren't necessarily valid filenames.
In the future, please post more complete code. The code that sets variables you're using is important - garbage in, garbage out.
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LEARN ABOUT DEBIAN
bup-index
bup-index(1) General Commands Manual bup-index(1)
NAME
bup-index - print and/or update the bup filesystem index
SYNOPSIS
bup index <-p|-m|-s|-u> [-H] [-l] [-x] [--fake-valid] [--fake-invalid] [--check] [-f indexfile] [--exclude path] [--exclude-from filename]
[-v]
DESCRIPTION
bup index prints and/or updates the bup filesystem index, which is a cache of the filenames, attributes, and sha-1 hashes of each file and
directory in the filesystem. The bup index is similar in function to the git(1) index, and can be found in ~/.bup/bupindex.
Creating a backup in bup consists of two steps: updating the index with bup index, then actually backing up the files (or a subset of the
files) with bup save. The separation exists for these reasons:
1. There is more than one way to generate a list of files that need to be backed up. For example, you might want to use inotify(7) or dno-
tify(7).
2. Even if you back up files to multiple destinations (for added redundancy), the file names, attributes, and hashes will be the same each
time. Thus, you can save the trouble of repeatedly re-generating the list of files for each backup set.
3. You may want to use the data tracked by bup index for other purposes (such as speeding up other programs that need the same informa-
tion).
MODES
-u, --update
recursively update the index for the given filenames and their descendants. One or more filenames must be given. If no mode option
is given, this is the default.
-p, --print
print the contents of the index. If filenames are given, shows the given entries and their descendants. If no filenames are given,
shows the entries starting at the current working directory (.) .
-m, --modified
prints only files which are marked as modified (ie. changed since the most recent backup) in the index. Implies -p.
-s, --status
prepend a status code (A, M, D, or space) before each filename. Implies -p. The codes mean, respectively, that a file is marked in
the index as added, modified, deleted, or unchanged since the last backup.
OPTIONS
-H, --hash
for each file printed, prepend the most recently recorded hash code. The hash code is normally generated by bup save. For objects
which have not yet been backed up, the hash code will be 0000000000000000000000000000000000000000. Note that the hash code is
printed even if the file is known to be modified or deleted in the index (ie. the file on the filesystem no longer matches the
recorded hash). If this is a problem for you, use --status.
-l, --long
print more information about each file, in a similar format to the -l option to ls(1).
-x, --xdev, --one-file-system
don't cross filesystem boundaries when recursing through the filesystem. Only applicable if you're using -u.
--fake-valid
mark specified filenames as up-to-date even if they aren't. This can be useful for testing, or to avoid unnecessarily backing up
files that you know are boring.
--fake-invalid
mark specified filenames as not up-to-date, forcing the next "bup save" run to re-check their contents.
--check
carefully check index file integrity before and after updating. Mostly useful for automated tests.
-f, --indexfile=indexfile
use a different index filename instead of ~/.bup/bupindex.
--exclude=path
a path to exclude from the backup (can be used more than once)
--exclude-from=filename
a file that contains exclude paths (can be used more than once)
-v, --verbose
increase log output during update (can be used more than once). With one -v, print each directory as it is updated; with two -v,
print each file too.
EXAMPLE
bup index -vux /etc /var /usr
SEE ALSO
bup-save(1), bup-drecurse(1), bup-on(1)
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown- bup-index(1)