https://adventofcode.com/2022/day/7

The immediate size of a directory is the list of the files contained in it directly, while the total size includes the files that are contained within subdirectories.

>>> :{
:main +
    "$ cd /\n\
    \$ ls\n\
    \dir a\n\
    \14848514 b.txt\n\
    \8504156 c.dat\n\
    \dir d\n\
    \$ cd a\n\
    \$ ls\n\
    \dir e\n\
    \29116 f\n\
    \2557 g\n\
    \62596 h.lst\n\
    \$ cd e\n\
    \$ ls\n\
    \584 i\n\
    \$ cd ..\n\
    \$ cd ..\n\
    \$ cd d\n\
    \$ ls\n\
    \4060174 j\n\
    \8033020 d.log\n\
    \5626152 d.ext\n\
    \7214296 k\n"
:}
95437
24933642