数据备份

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# rsync --help |grep -E '^[ ]+-a'
 -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)

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# rsync --help |grep -E '^[ ]+-[rlptgoD]'
 -r, --recursive             recurse into directories
 -l, --links                 copy symlinks as symlinks
 -p, --perms                 preserve permissions
 -o, --owner                 preserve owner (super-user only)
 -g, --group                 preserve group
 -D                          same as --devices --specials
 -t, --times                 preserve modification times

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# rsync --help | grep -E '^[ ]+(--devices|--specials)'
     --devices               preserve device files (super-user only)
     --specials              preserve special files

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# grep --help |grep PATTERN
Usage: grep [OPTION]... PATTERN [FILE]...
Search for PATTERN in each FILE or standard input.
PATTERN is, by default, a basic regular expression (BRE).
  -E, --extended-regexp     PATTERN is an extended regular expression (ERE)
  -F, --fixed-strings       PATTERN is a set of newline-separated fixed strings
  -G, --basic-regexp        PATTERN is a basic regular expression (BRE)
  -P, --perl-regexp         PATTERN is a Perl regular expression
  -e, --regexp=PATTERN      use PATTERN for matching
  -f, --file=FILE           obtain PATTERN from FILE
  -w, --word-regexp         force PATTERN to match only whole words
  -x, --line-regexp         force PATTERN to match only whole lines
  -o, --only-matching       show only the part of a line matching PATTERN
      --include=FILE_PATTERN
                            search only files that match FILE_PATTERN
      --exclude=FILE_PATTERN
                            skip files and directories matching FILE_PATTERN
      --exclude-dir=PATTERN directories that match PATTERN will be skipped.

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# rsync --help |grep -P '^[ ]+(-[rlptgoD]|--devices|--specials)'
 -r, --recursive             recurse into directories
 -l, --links                 copy symlinks as symlinks
 -p, --perms                 preserve permissions
 -o, --owner                 preserve owner (super-user only)
 -g, --group                 preserve group
     --devices               preserve device files (super-user only)
     --specials              preserve special files
 -D                          same as --devices --specials
 -t, --times                 preserve modification times

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# rsync --help |grep '^[ ]\+\(-[rlptgoD]\|--devices\|--specials\)'
 -r, --recursive             recurse into directories
 -l, --links                 copy symlinks as symlinks
 -p, --perms                 preserve permissions
 -o, --owner                 preserve owner (super-user only)
 -g, --group                 preserve group
     --devices               preserve device files (super-user only)
     --specials              preserve special files
 -D                          same as --devices --specials
 -t, --times                 preserve modification times

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# rsync --help|grep -E '^[ ]+-u'
 -u, --update                skip files that are newer on the receiver

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# rsync --help|grep -E '^[ ]+--ignore-existing'
     --ignore-existing       skip updating files that already exist on receiver