(12)
`find . -name "src" -type d`
`find . -path "*/test/*.python" -type f`
d: directory; f: file
`find . -mtime -1`
find all files modified in the last day
`find . -size +500k -size -10M -name '*.tar.gz'`
Find all zip files with size in range 500k to 10M

(13)
You can also use `find` to execute some commands:
`find . -name "*.tmp" -exec rm {}`
——我很好奇这个花括号是怎么用的。

(14)
https://tldr.sh/
tldr gives you examples of each flag of a shell command.

#systemprogramming #shell