AWK usage tips

1 -F delimiter contains special characters
  A square brackets []
    three right slash escapes

-F'\\\['

  B Single quotation
    marks are used outside the   single quotation marks

-F"'"

  Examples that come together
   

awk -F"\\\[ '" '{print $2}' 文件名 | awk -F"'" '{print $1}' > out

2 Commonly used built-in functions
split

3 Process multiple files at the same time

4 File deduplication