使用sed从txt文件中删除行

Question

我有一个大文本文件,我想从中删除另一个文本文件中的一些行.似乎sedUnix shell 中的命令是一个很好的方法.但是,我无法弄清楚要使用哪些标志..

database.txt:

this is line 1
this is line 2
this is line 3
this is line 4
this is line 5

lines_to_remove.txt

this is line 1
this is line 3

what_i_want.txt

this is line 2
this is line 4
this is line 5

Answer 1

grep比sed这个更适合:

grep -Fxv -f lines_to_remove.txt database.txt > what_i_really_really_want.txt