[英]remove lines in file from stream
cat file_a
aaa
bbb
ccc
cat file_b
ddd
eee
fff
cat file_x
bbb
ccc
ddd
eee
I want to cat file_a file_b | remove_from_stream_what_is_in(file_x)
我要cat file_a file_b | remove_from_stream_what_is_in(file_x)
cat file_a file_b | remove_from_stream_what_is_in(file_x)
Result: 结果:
aaa
fff
If there is no basic filter to do this with, then I wonder if there is a way with ruby -ne '...'
. 如果没有基本的过滤器可以做到这一点,那么我想知道是否有办法使用ruby -ne '...'
。
Try: 尝试:
$ cat file_a file_b | grep -vFf file_x
aaa
fff
-v
means remove matching lines. -v
表示删除匹配的行。
-F
tells grep to treat the match patterns as fixed strings, not regular expressions. -F
告诉grep将匹配模式视为固定字符串,而不是正则表达式。
-f file_x
tells grep to get the match patterns from the lines of file_x
. -f file_x
告诉grep从file_x
行获取匹配模式。
Other options that you may want to consider are: 您可能要考虑的其他选项是:
-w
tells grep to match only complete words. -w
告诉grep仅匹配完整的单词。
-x
tells grep to match only complete lines. -x
告诉grep只匹配完整的行。
IO.write('file_a', %w| aaa bbb ccc |.join("\n")) #=> 11
IO.write('file_b', %w| ddd eee fff |.join("\n")) #=> 11
IO.write('file_x', %w| bbb ccc ddd eee |.join("\n")) #=> 15
From Ruby: 从Ruby:
IO.readlines('file_a', chomp: true) + IO.readlines('file_b', chomp: true) -
IO.readlines('file_x', chomp: true)
#=> ["aaa", "fff"]
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