按k/M/G单位显示各分区大小：df -hweb
显示文件大小：dushell
- 包括文件，而非仅是目录：-a或–all
- produce a grand total: -c
- print sizes in human readable format: -h, –human-readable
- do not include size of subdirectories: -S, –separate-dirs
- display only a total for each argument: -s, –summarize
- exclude files that match a shell pattern (not a regular expression): –exclude=
- -d, –max-depth=
split [OPTION]… [INPUT [PREFIX]]express
- default to two: -a, –suffix-length=
- size per file. can be followed by KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y: -b, –bytes=
- suffixes not alphabetic: -d, –numeric-suffixes
- specify number of files: -n, –number= use cat to combine them again.