138 lines
2.5 KiB
Plaintext
138 lines
2.5 KiB
Plaintext
.TH DERP 1
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.SH NAME
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derp \- directory-examining recursive compare
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.SH SYNOPSIS
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.B derp
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[
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.B -qcutDL
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] [
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.B -p
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.I perms
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]
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.I myfile
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.I oldfile
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.I yourfile
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.SH DESCRIPTION
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.I Derp
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recursively compares the two directories
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.I myfile
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and
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.I yourfile
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using a third common backup directory
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.I oldfile
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as reference. The changes found are printed
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to standard output, one per line, with the file
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status describing either sides actions followed
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by tabulator and the relative file path which might
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be empty in case when the changed files refers to the
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ones given at program arguments.
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.LP
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The possible status codes:
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.TP
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.B an
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File added in
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.I myfile
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.TP
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.B na
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File added in
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.I yourfile
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.TP
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.B aa!
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Both sides added different files with the
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same name
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.TP
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.B mn
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File was modified in
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.I myfile
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.TP
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.B nm
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File was modified in
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.I yourfile
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.TP
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.B mm!
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File was changed differently in
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.I myfile
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and
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.I yourfile
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.TP
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.B dn
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File was deleted in
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.I myfile
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.TP
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.B nd
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File was deleted in
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.I yourfile
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.TP
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.B md!
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File was modified in
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.I myfile
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but deleted in
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.I yourfile
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.TP
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.B dm!
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File was modified in
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.I yourfile
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but deleted in
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.I myfile
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.LP
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Errors are printed to standard error unless
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.B -q
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option is specified. The program is terminated
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when errors are encountered unless the
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.B -c
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option is given. This can be useful if files
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are not accessible due to file permission or
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media corruption.
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.PP
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The
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.B -u
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option will consider changes of file owner and group.
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When omitted, file ownership is ignored.
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.PP
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The
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.B -p
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option sets the octal mask
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.I perms
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of bits to check in the file permissions. The default
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ignores file permissions.
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.PP
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When modification times are comparable then the
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.B -t
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option can be used to quickly find changes. If specified,
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files are considered unchanged if the name, file size and
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the modification time matches. This is useful when
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comparing /n/dump archives on the same fileserver.
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.PP
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Files are considered the same if they are from the
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same mount and their
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.B qid
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(see
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.IR stat (5))
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matches. For directories, the access time is also
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compared. If the access time was disabled on the
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fileserver, then all directories need to be compared
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using the
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.B -D
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option.
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.PP
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Some filesystems like
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.IR hgfs (4)
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do not always return exact file size in stat, so
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the length check can be disabled with the
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.B -L
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option.
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.SH SOURCE
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.B /sys/src/cmd/derp.c
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.SH "SEE ALSO"
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.IR cmp (1),
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.IR diff (1),
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.IR history (1),
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.IR fs (4),
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.IR hgfs (4)
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.SH DIAGNOSTICS
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The exit status is set to 'errors' when
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errors were encountered.
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.SH HISTORY
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.I Derp
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first appeared in 9front (November, 2012).
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