本篇主要写一些shell脚本文本处理工具sed的使用。

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概述

sed（Stream EDitor）是一个强大而简单的文本解析转换工具，可以读取文本，并根据指定的条件对文本内容进行编辑（删除、替换、添加、移动等），最后输出所有行或者仅输出处理的某些行。

sed也可以在无交互的情况下实现相复杂的文本处理操作，被广泛应用于Shell脚本中，用以完成各种自动化处理任务。

sed的工作流程主要包括读取、执行和显示三个过程：

• 读取：sed从输入流（文件、管道、标准输入）中读取一行内容并存储到临时的缓冲区中（又称模式空间，pattern space）
• 执行：默认情况下，所有的sed命令都在模式空间中顺序地执行，除非指定了行的地址，否则 sed命令将会在所有的行上依次执行
• 显示：发送修改后的内容到输出流。再发送数据后，模式空间将会被清空

在所有的文件内容都被处理完成之前，上述过程将重复执行，直至所有内容被处理完。

默认情况下,所有的sed命令都是在模式空间内执行的，因此输入的文件并不会发生任何变化，除非是用重定向存储输出。

命令常见用法

• 命令有两种格式：

sed [选项] '编辑指令' 文件1 文件2...

sed [选项] -f 脚本文件 文件1 文件2...

• 常见的命令选项

-e或--expression=：表示用指定命令或者脚本来处理输入的文本文件

-f或--file=：表示用指定的脚本文件来处理输入的文本文件

-h或--help：显示帮助

-n、--quiet或silent：表示仅显示处理后的结果

-i：直接编辑文本文件

• 操作

通常情况下是采用的[n1[,n2]]操作参数的格式。

a：增加，在当前行下面增加一行指定内容

c：替换，将选定行替换为指定内容

d：删除，删除选定的行

i：插入，在选定行上面插入一行指定内容

p：打印，如果同时指定行，表示打印指定行；如果不指定行，则表示打印所有内容；如果有非打印字符，则以ASCII码输出。其通常与-n选项一起使用

s：替换，替换指定字符

y：字符转换

示例

输出符合条件的文本“p”

• 输出所有内容,等同于cat test.txt

[root@localhost ~]# sed -n 'p' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 输出第3行

[root@localhost ~]# sed -n '3p' test.txt

The home of Football on BBC Sport online.

• 输出3~5行

[root@localhost ~]# sed -n '3,5p' test.txt

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

• 输出所有奇数行，n表示读入下一行资料

[root@localhost ~]# sed -n 'p;n' test.txt

he was short and fat.

The home of Football on BBC Sport online.

google is the best tools for search keyword.

PI=3.141592653589793238462643383249901429

Actions speak louder than words

#woooooood #

I bet this place is really spooky late at night!

I shouldn't have lett so tast.

• 输出所有偶数行，n表示读入下一行资料

[root@localhost ~]# sed -n 'n;p' test.txt

He was wearing a blue polo shirt with black pants.

the tongue is boneless but it breaks bones.12!

The year ahead will test our political establishment to the limit.

a wood cross!

#woood #

AxyzxyzxyzxyzC

Misfortunes never come alone/single.

• 输出第1~5行之间的奇数行（1，3，5）

[root@localhost ~]# sed -n '1,5{n;p}' test.txt

He was wearing a blue polo shirt with black pants.

the tongue is boneless but it breaks bones.12!

The year ahead will test our political establishment to the limit.

• 输出第10行至文件尾之间的偶数行（11，13，15）

[root@localhost ~]# sed -n '10,${n;p}' test.txt 

#woooooood #

I bet this place is really spooky late at night!

I shouldn't have lett so tast.

sed命令结合正则表达式时，格式略有不同，正则表达式以/包围。

• 输出包含the的行

[root@localhost ~]# sed -n '/the/p' test.txt

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

• 输出从第4行至第一个包含the的行

[root@localhost ~]# sed -n '4,/the/p' test.txt

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

• 输出包含the的行所在的行号,等号=用来输出行号

[root@localhost ~]# sed -n '/the/=' test.txt

4

5

6

• 输出以PI开头的行

[root@localhost ~]# sed -n '/^PI/p' test.txt

PI=3.141592653589793238462643383249901429

• 输出以数字结尾的行

[root@localhost ~]# sed -n '/[0-9]$/p' test.txt

PI=3.141592653589793238462643383249901429

• 输出包含单词wood 的行,\<、\>代表单词边界

[root@localhost ~]# sed -n '/\<wood\>/p' test.txt

a wood cross!

删除符合条件的文本“d”

nl命令用来计算文件的行数

• 删除第3行

[root@localhost ~]# nl test.txt | sed '3d'

     1	he was short and fat.

     2	He was wearing a blue polo shirt with black pants.

     4	the tongue is boneless but it breaks bones.12!

     5	google is the best tools for search keyword.

     6	The year ahead will test our political establishment to the limit.

     7	PI=3.141592653589793238462643383249901429

     8	a wood cross!

     9	Actions speak louder than words

    10	#woood #

    11	#woooooood #

    12	AxyzxyzxyzxyzC

    13	I bet this place is really spooky late at night!

    14	Misfortunes never come alone/single.

    15	I shouldn't have lett so tast.

• 删除第3~5行

[root@localhost ~]# nl test.txt | sed '3,5d'

     1	he was short and fat.

     2	He was wearing a blue polo shirt with black pants.

     6	The year ahead will test our political establishment to the limit.

     7	PI=3.141592653589793238462643383249901429

     8	a wood cross!

     9	Actions speak louder than words

    10	#woood #

    11	#woooooood #

    12	AxyzxyzxyzxyzC

    13	I bet this place is really spooky late at night!

    14	Misfortunes never come alone/single.

    15	I shouldn't have lett so tast.

• 删除包含cross的行,原本的第8行被删除

[root@localhost ~]# nl test.txt | sed '/cross/d'

     1	he was short and fat.

     2	He was wearing a blue polo shirt with black pants.

     3	The home of Football on BBC Sport online.

     4	the tongue is boneless but it breaks bones.12!

     5	google is the best tools for search keyword.

     6	The year ahead will test our political establishment to the limit.

     7	PI=3.141592653589793238462643383249901429

     9	Actions speak louder than words

    10	#woood #

    11	#woooooood #

    12	AxyzxyzxyzxyzC

    13	I bet this place is really spooky late at night!

    14	Misfortunes never come alone/single.

    15	I shouldn't have lett so tast.

• 删除不包含cross的行,用!符号表示取反操作

[root@localhost ~]# nl test.txt | sed '/cross/!d'

     8	a wood cross!

• 删除以小写字母开头的行

[root@localhost ~]# sed '/^[a-z]/d' test.txt

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 删除以.结尾的行

[root@localhost ~]# sed '/\.$/d' test.txt

the tongue is boneless but it breaks bones.12!

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

• 删除所有空行

[root@localhost ~]# sed '/^$/d' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 删除重复的空行，即连续空行只保留一个

[root@localhost ~]# sed '/^$/{n;/^$/d}' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

[root@localhost ~]# cat -s test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

替换符合条件的文本

s（字符串替换）

c（整行/整块替换）

y（字符转换）

• 将每行中的第一个the替换为THE

[root@localhost ~]# sed 's/the/THE/' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

THE tongue is boneless but it breaks bones.12!

google is THE best tools for search keyword.

The year ahead will test our political establishment to THE limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 将每行中的第3个l替换为L

[root@localhost ~]# sed 's/l/L/3' test.txt

he was short and fat.

He was wearing a blue polo shirt with bLack pants.

The home of Football on BBC Sport onLine.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our poLitical establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is realLy spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 将文件中的所有the替换为THE

[root@localhost ~]# sed 's/the/THE/g' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

THE tongue is boneless but it breaks bones.12!

google is THE best tools for search keyword.

The year ahead will test our political establishment to THE limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 将文件中的所有o删除(替换为空串)

[root@localhost ~]# sed 's/o//g' test.txt

he was shrt and fat.

He was wearing a blue pl shirt with black pants.

The hme f Ftball n BBC Sprt nline.

the tngue is bneless but it breaks bnes.12!

ggle is the best tls fr search keywrd.

The year ahead will test ur plitical establishment t the limit.

PI=3.141592653589793238462643383249901429

a wd crss!

Actins speak luder than wrds

#wd #

#wd #

AxyzxyzxyzxyzC

I bet this place is really spky late at night!

Misfrtunes never cme alne/single.

I shuldn't have lett s tast.

• 在每行行首插入#号

[root@localhost ~]# sed 's/^/#/' test.txt

#he was short and fat.

#He was wearing a blue polo shirt with black pants.

#The home of Football on BBC Sport online.

#the tongue is boneless but it breaks bones.12!

#google is the best tools for search keyword.

#The year ahead will test our political establishment to the limit.

#PI=3.141592653589793238462643383249901429

#a wood cross!

#Actions speak louder than words

#

#

##woood #

##woooooood #

#AxyzxyzxyzxyzC

#I bet this place is really spooky late at night!

#Misfortunes never come alone/single.

#I shouldn't have lett so tast.

• 在包含the的每行行首插入#号

[root@localhost ~]# sed '/the/s/^/#/' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

#the tongue is boneless but it breaks bones.12!

#google is the best tools for search keyword.

#The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 在每行行尾插入字符串EOF

[root@localhost ~]# sed 's/$/EOF/' test.txt

he was short and fat.EOF

He was wearing a blue polo shirt with black pants.EOF

The home of Football on BBC Sport online.EOF

the tongue is boneless but it breaks bones.12!EOF

google is the best tools for search keyword.EOF

The year ahead will test our political establishment to the limit.EOF

PI=3.141592653589793238462643383249901429EOF

a wood cross!EOF

Actions speak louder than wordsEOF

EOF

EOF

#woood #EOF

#woooooood #EOF

AxyzxyzxyzxyzCEOF

I bet this place is really spooky late at night!EOF

Misfortunes never come alone/single.EOF

I shouldn't have lett so tast.EOF

• 将第3~5行中的所有the替换为THE

[root@localhost ~]# sed '3,5s/the/THE/g' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

THE tongue is boneless but it breaks bones.12!

google is THE best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 将包含the的所有行中的o都替换为O

[root@localhost ~]# sed '/the/s/o/O/g' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tOngue is bOneless but it breaks bOnes.12!

gOOgle is the best tOOls fOr search keywOrd.

The year ahead will test Our pOlitical establishment tO the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

迁移符合条件的文本

H（复制到剪贴板）

g、G（将剪贴板中的数据覆盖/追加至指定行）

w（保存为文件）

r（读取指定文件）

a（追加指定内容）

• 将包含the的行迁移至文件末尾，{;}用于多个操作

[root@localhost ~]# sed '/the/{H;d};$G' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

• 将第1~5行内容转移至第17行后

[root@localhost ~]# sed '1,5{H;d};17G' test.txt

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

• 将包含the的行另存为文件out.file

[root@localhost ~]# sed '/the/w out.file' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

[root@localhost ~]# cat out.file

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

• 将文件/etc/hostname的内容添加到包含the的每行以后

[root@localhost ~]# sed '/the/r /etc/hostname' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

localhost.localdomain

google is the best tools for search keyword.

localhost.localdomain

The year ahead will test our political establishment to the limit.

localhost.localdomain

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 在第3行后插入一个新行,内容为New

[root@localhost ~]# sed '3aNew' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

New

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 在包含the的每行后插入一个新行，内容为New

[root@localhost ~]# sed '/the/aNew' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

New

google is the best tools for search keyword.

New

The year ahead will test our political establishment to the limit.

New

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

• 在第3行后插入多行内容，中间的\n表示换行

[root@localhost ~]# sed '3aNew1\nNew2' test.txt

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

New1

New2

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

使用脚本编辑文件

将多个编辑指令存放到文件中（每行一条编辑指令），通过-f选项来调用

• 将第1~5行内容转移至第17行后，以上操作可以改用脚本文件方式：

[root@localhost ~]# vim opt.list

1,5H

1,5d

17G

[root@localhost ~]# sed -f opt.list test.txt

The year ahead will test our political establishment to the limit.

PI=3.141592653589793238462643383249901429

a wood cross!

Actions speak louder than words

#woood #

#woooooood #

AxyzxyzxyzxyzC

I bet this place is really spooky late at night!

Misfortunes never come alone/single.

I shouldn't have lett so tast.

he was short and fat.

He was wearing a blue polo shirt with black pants.

The home of Football on BBC Sport online.

the tongue is boneless but it breaks bones.12!

google is the best tools for search keyword.

直接操作文件示例

#!/bin/bash

# 指定样本文件路径、配置文件路径

SAMPLE="/usr/share/doc/vsftpd-3.0.2/EXAMPLE/INTERNET_SITE/vsftpd.conf"

CONFIG="/etc/vsftpd/vsftpd.conf"

# 备份原来的配置文件,检测文件名为/etc/vsftpd/vsftpd.conf.bak 备份文件是否存在, 若不存在则使用 cp 命令进行文件备份

[ ! -e "$CONFIG.bak" ] && cp $CONFIG $CONFIG.bak

# 基于样本配置进行调整,覆盖现有文件

sed -e '/^anonymous_enable/s/YES/NO/g' $SAMPLE > $CONFIG

sed -i -e '/^local_enable/s/NO/YES/g' -e '/^write_enable/s/NO/YES/g' $CONFIG

grep "listen" $CONFIG || sed -i '$alisten=YES' $CONFIG

# 启动vsftpd 服务,并设为开机后自动运行

systemctl restart vsftpd

systemctl enable vsftpd