如何删除一个文本中相同行中的其中一行？

yestreenstars

回复 8# jason680

the same way to do it by perl:

1. perl -ne '$s.=$_;END{$s=~s/(.*)\naaaaaaa/$1/s;print $s}'

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yestreenstars

回复 9# Herowinter

it is too easy to do it.

1. sed '0,/aaaaaaa/{//d}'

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Herowinter

回复 12# yestreenstars
Then, how about this one?

1. tac i|sed '0,/aaaaaaa/{//d}'|tac
   
2. aaaaaaa
   
3. bbbbbbb
   
4. aaaaaaa
   
5. ddddddd
   
6. fffffff
   
7. ccccccc

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yestreenstars

回复 13# Herowinter

i don't like use too much pipe.
   

Herowinter

回复 14# yestreenstars
//d什么意思，没见过这种用法，
我自己写的时候，用d老是有问题。
   

yestreenstars

回复 15# Herowinter

`/REGEXP/'
     This will select any line which matches the regular expression
     REGEXP.  If REGEXP itself includes any `/' characters, each must
     be escaped by a backslash (`\').

     The empty regular expression `//' repeats the last regular
     expression match (the same holds if the empty regular expression is
     passed to the `s' command).  Note that modifiers to regular
     expressions are evaluated when the regular expression is compiled,
     thus it is invalid to specify them together with the empty regular
     expression.

   

Herowinter

回复 16# yestreenstars
多谢，要info sed的， man sed没有。

   

free_2006

已经解决了，多谢各位

yestreenstars

回复 17# Herowinter

是的~ info要比man详细得多~