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分享sed a 命令
$sed '/1333/a\' second.txt
1
third
$sed '/1/a\' second.txt
1
third
$
并没有插入 也没有提示插入的地方
[1addr]a\
text Write text to standard output immediately before each attempt to read a line of input, whether by executing the ``N'' function or by beginning a new
cycle.
[2addr]b[label]
Branch to the ``:'' function with the specified label. If the label is not specified, branch to the end of the script.
[2addr]c\
text Delete the pattern space. With 0 or 1 address or at the end of a 2-address range, text is written to the standard output.
[2addr]d
Delete the pattern space and start the next cycle.
d能看懂 a\ c\是什么鬼
The argument text consists of one or more lines. To embed a newline in the text, precede it with a backslash. Other backslashes in text are deleted and the
following character taken literally.
1
third
$sed '/1/a\' second.txt
1
third
$
并没有插入 也没有提示插入的地方
[1addr]a\
text Write text to standard output immediately before each attempt to read a line of input, whether by executing the ``N'' function or by beginning a new
cycle.
[2addr]b[label]
Branch to the ``:'' function with the specified label. If the label is not specified, branch to the end of the script.
[2addr]c\
text Delete the pattern space. With 0 or 1 address or at the end of a 2-address range, text is written to the standard output.
[2addr]d
Delete the pattern space and start the next cycle.
d能看懂 a\ c\是什么鬼
The argument text consists of one or more lines. To embed a newline in the text, precede it with a backslash. Other backslashes in text are deleted and the
following character taken literally.
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echo_no_bug 2015-10-15
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发现我们搞错了，这个问题应该看sed的版本，而不是bash的版本。下面我的sed 版本，不知OS X 上是不是GNU sed
$ sed --version
GNU sed version 4.2.1
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
[/quote]
发现我们搞错了，这个问题应该看sed的版本，而不是bash的版本。下面我的sed 版本，不知OS X 上是不是GNU sed
$ sed --version
GNU sed version 4.2.1
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
[/quote]
应该是内嵌入os系统了吧。。。
echo_no_bug 2015-10-15
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你是哪个shell呢？？
我的是bash
$ echo $SHELL
/bin/bash
[/quote]
下面是我的bash环境。你回复我怎么不引用我回复，而引用你自己的回复呢？
$ echo $SHELL
/bin/bash
$ bash -version
GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
[/quote]
手滑。。。。。。。奇怪了 sed的version都打不开 我试着php awk的version又可以。。。。 真心辛苦了 这么晚还回答我问题
~/Public/pingan/tmp $php --version
PHP 5.4.38 (cli) (built: Mar 19 2015 14:49:15)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
~/Public/pingan/tmp $sed --version
sed: illegal option -- -
usage: sed script [-Ealn] [-i extension] [file ...]
sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]
~/Public/pingan/tmp $awk --version
awk version 20070501
vachel66 2015-10-15
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发现我们搞错了，这个问题应该看sed的版本，而不是bash的版本。下面我的sed 版本，不知OS X 上是不是GNU sed
$ sed --version
GNU sed version 4.2.1
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
vachel66 2015-10-15
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你是哪个shell呢？？
我的是bash
$ echo $SHELL
/bin/bash
[/quote]
下面是我的bash环境。你回复我怎么不引用我回复，而引用你自己的回复呢？
$ echo $SHELL
/bin/bash
$ bash -version
GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
echo_no_bug 2015-10-15
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你是哪个shell呢？？
我的是bash
$ echo $SHELL
/bin/bash
vachel66 2015-10-15
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没有OS X 环境，在Linux 上man sed 没有你提到的那段，看来不同环境上是有区别
echo_no_bug 2015-10-15
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没有人么 up
echo_no_bug 2015-10-15
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上次回复了 居然没有提交上来 我的是os bash 是脚本的差异吧
sed: 1: "a It works.": command a expects \ followed by text
~/Public/pingan/tmp $sed 'c\ It works.' testls_sort.txt
sed: 1: "c\ It works.": extra characters after \ at the end of c command
~/Public/pingan/tmp $sed 'c It works.' testls_sort.txt
sed: 1: "c It works.": command c expects \ followed by text
－－－－－－－－－－－我是分割线－－－－－－－－－－－－－－－－－－－
我可能会问一个傻逼的问题。以下是的man sed 结果截取的一段
SYNOPSIS
sed [-Ealn] command [file ...]
sed [-Ealn] [-e command] [-f command_file] [-i extension] [file ...]
-E Interpret regular expressions as extended (modern) regular expressions rather than basic regular expressions (BRE's). The re_format(7) manual page
fully describes both formats.
傻逼问题来了，所以大致的格式是sed -e command [file] 这个command 指的是什么？在man sed结果的哪个部分呢，我怎么找到呢
vachel66 2015-10-11
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你的格式错了，所以没有效果，看我下面测试的情况。
首先测试文件test.txt 包含如下两行内容
然后看sed a 的效果，在每行后面追加了一行
可以指定只在第二行后面追加内容，如果要追加的内容需要换行，就先输入反斜线，再敲回车
c的用法与a类似，例如，将第一行替换为指定内容
像sed, awk这些高级命令我也记不住具体格式，每次都需要查下测试下才能写出来
今天值班ing
首先测试文件test.txt 包含如下两行内容
$ less test.txt
This is a test file.
I am testing sed command.
$
然后看sed a 的效果，在每行后面追加了一行
$ sed 'a It works.' test.txt
This is a test file.
It works.
I am testing sed command.
It works.
$
可以指定只在第二行后面追加内容，如果要追加的内容需要换行，就先输入反斜线，再敲回车
$ sed '2a It works.\
Very great!' test.txt
This is a test file.
I am testing sed command.
It works.
Very great!
$
c的用法与a类似，例如，将第一行替换为指定内容
$ sed '1c The first line is replaced.' test.txt
The first line is replaced.
I am testing sed command.
$
像sed, awk这些高级命令我也记不住具体格式，每次都需要查下测试下才能写出来
今天值班ing
