ls 命令替代品：exa
exa 是使用 Rust 语言编写的 ls 文件列表命令替代品。
参数列表：
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-1, --oneline: display one entry per line
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-a, --all: show dot files
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-b, --binary: use binary (power of two) file sizes
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-B, --bytes: list file sizes in bytes, without prefixes
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-d, --list-dirs: list directories as regular files
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-g, --group: show group as well as user
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-h, --header: show a header row
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-H, --links: show number of hard links column
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-i, --inode: show inode number column
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-l, --long: display extended details and attributes
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-r, --reverse: reverse sort order
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-R, --recurse: recurse into subdirectories
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-s, --sort=(field): field to sort by
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-S, --blocks: show number of file system blocks
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-t, --time: which timestamp to show for a file
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-T, --tree: recurse into subdirectories in a tree view
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-x, --across: sort multi-column view entries across