用 单引号.
双引号shell会把 $a 和 $_ 转义的.
On 11月12日, 上午8时36分, "Haiyan Lin" <[email protected]> wrote:
> 试了一下，得到下面的信息：
>
> [li...@localhost try]$ more lll
> lllll
> lllll
> skdfksdfas
> lllll
> skdfksdfas
> kkkk
> [li...@localhost try]$ perl -nle "print unless $a{$_}++;" lll > ll
> Can't modify anonymous hash ({}) in postincrement (++) at -e line 1, near
> "}++"
> Execution of -e aborted due to compilation errors.
>
> ----- Original Message -----
> From: "Tiger Peng" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, November 11, 2009 11:20 PM
> Subject: [PerlChina] Re: 请教哈:将文件中重复的行,替换,只保留一行
>
> > 试试：
> > perl -nle 'print unless $a{$_}++' infile > outfile.
> > 如果文件太大，要用很多memory。
>
> > 2009/11/11 Haiyan Lin <[email protected]>:
>
> >> 希望保留原顺利，对于重复行，只保留首次出席的那行
>
> >> ----- Original Message -----
> >> From: "TBY" <[email protected]>
> >> To: "PerlChina Mongers 讨论组" <[email protected]>
> >> Sent: Wednesday, November 11, 2009 7:36 PM
> >> Subject: [PerlChina] Re: 请教哈:将文件中重复的行,替换,只保留一行
>
> >>> 用hash有问题的吧，行顺序全打乱了要紧么？
>
> >>> 用uniq是最好的。
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