怎样合并相同行？

水星

例如：
a
b
b
b
c

合并相邻的相同行为一行：
a
b
c

原先以为uniq可以，但uniq把相同行都删掉了。

水星

找到个好方法：

awk '!a[$0]++' file

squallabc

sort -u也可以的吧

walkerxk

我这的uniq正常（版本是5.97），sort会排序的楼主应该不用排序的吧。

水星

对，正是因为不要排序，所以才不用sort。

uniq会把相同的行全部删掉，而我是想只留一行，不知ls的uniq有这种功能？我用的是5.93的版本。

ideawu

如果相同的行不在一起, uniq不起作用.

lxmxn

相同的行不在一起，awk的方法也不成。

BEINGJESSE

.........

lifecat9

uniq  1.log -c
你好好看看吧

springwind426

1. 
   
2. uniq 文件
   

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uniq --version
uniq (GNU coreutils) 5.97
Copyright (C) 2006 Free Software Foundation, Inc.
这是自由软件。您可以按照 GNU GPL 协议 <http://www.gnu.org/licenses/gpl.html> 的条款再发布此软件的副本，但我们无法保证相关法律不对这一情形进行限制。

由 Richard Stallman 和 David MacKenzie 编写。

1. 
   
2. awk 'BEGIN{oldline="\n"}{if($0!=oldline)print $0;oldline=$0}'  文件
   

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awk --version
GNU Awk 3.1.5
Copyright (C) 1989, 1991-2005 Free Software Foundation.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

1. 
   
2. (oldline=$'\n\n'; while read line;do [ "$oldline" != "$line" ] && echo $line ; oldline="$line";done) <文件
   

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bash --version
GNU bash, version 3.1.17(1)-release (i486-pc-linux-gnu)
Copyright (C) 2005 Free Software Foundation, Inc.