grep console配色方案

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mob64ca14082604 2024-09-16 13:27:13

文章标签 grep console配色方案 sed Red 字符串 文章分类 云原生云计算

1、grep

grep是一个强大的文本搜索工具

（1）用法

grep [选项] [文件]

常用选项及含义

选项	含义
-c	只输出匹配行的数量
-i	搜索时忽略大小写
-h	查询多文件时不显示文件名
-n	列出所匹配行，并显示行号
-w	匹配整词
-x	匹配整行
-r	递归搜索
-E	支持扩展的正则表达式
-F	不支持正则，按照字符串字面意义进行匹配

（2）示例

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2、sed

sed是一个非交互式的行文本编辑器，它与文本编辑器的区别是操作对象不同。文本编辑器操作对象是整个文件，而sed操作对象是文本中的一行。

grep console配色方案_字符串

sed只对缓冲区中的原始文件的副本进行编辑后输出到屏幕，并不编辑原始文件。因此若需要保存改动的内容，需要重定向到另一个文件。

（1）用法

sed [选项] `｛命令｝[flags]` 文件名

选项及含义

选项	含义
-n	不打印所有行到标准输出
-e	表示将下一个字符串解析为sed编辑命令，如果只传一个编辑命令 -e可忽略 `sed [opt] -e command1 -e command2 ... -e commandn filename`
-f	表示正在调用sed脚本 `sed [opt] -f scriptfile inputfile`
-i	直接改动源文件，慎用。可以用`-i.bak`修改源文件的同时创建.bak备份文件

sed命令定位文本的方法

选项	含义
x	x指定行号
x,y	指定x行到y行范围
/pattern/	匹配包含pattern的行
/pattern/pattern/	查询包含两个模式的行
/pattern/,x	从与pattern的匹配行到x行之间的行
x,/pattern/	从x行到与pattern匹配行之间的行
x,y!	查询不包括x和y行号的行

sed常用编辑命令

选项	含义
p	打印匹配的行
=	打印文件行号
`a\`	在定位行号之后追加
`i\`	在定位行号之前插入
`d`	删除定位行
`c\`	表示将指定行中的所有内容，替换成选项后面的字符串
`s`	替换指定字符串
w filename	将文本写入到文件
r filename	从filename文本中读行
y	变换字符，把一个字符翻译成另外的字符
q	第一个模式匹配完退出
n	读取下一个输入行，用下一个命令处理新的行
h	将模式缓冲区的文本复制到保持缓冲区
H	将模式缓冲区的文本追加到保持缓冲区
x	互换模式缓冲区和保持缓冲区的内容
g	将保持缓冲区的内容复制到模式缓冲区
G	将保持缓冲区的内容追加到模式缓冲区

（2）示例

①sed命令选项的例子

-n选项

[root@localhost shell]# cat example				#用到的示例文本
1 white fox is looking at a white dog
2 white fox is looking at a white dog
3 white fox is looking at a white dog
4 white fox is looking at a white dog
5 white fox is looking at a white dog
[root@localhost shell]# sed -n '1p' example		#带-n选项，打印第一行
1 white fox is looking at a white dog
[root@localhost shell]# sed  '1p' example		#不带-n选项，打印第一行
1 white fox is looking at a white dog
1 white fox is looking at a white dog
2 white fox is looking at a white dog
3 white fox is looking at a white dog
4 white fox is looking at a white dog
5 white fox is looking at a white dog
[root@localhost shell]# sed -n '2,4p' example	#带-n打印2到4行
2 white fox is looking at a white dog
3 white fox is looking at a white dog
4 white fox is looking at a white dog
#可以清楚的看到-n选项不打印所有行是指不打印sed编辑对象的全部内容，只打印指定行

-e选项

sed不支持同时带多个编辑命令的用法。如：sed -n '/2/p=' example这样是错误的。要想使用多个编辑命令使用如下格式

sed [选型] -e '编辑命令1' -e '编辑命令2' ... -e '编辑命令n' filename

[root@localhost shell]# cat example				#用到的示例文本
1 white fox is looking at a white dog
2 white fox is looking at a white dog
3 white fox is looking at a white dog
4 white fox is looking at a white dog
5 white fox is looking at a white dog
[root@localhost shell]# sed -n -e '2p' -e '=' example	
1
2 white fox is looking at a white dog
2
3
4
5
#第一个编辑命令'2p'表示打印第二个，第二个编辑命令'='打印所有行号

-f选项

vim 创建一个sed脚本文件vim sedscript 执行chmod +x sedscript授予脚本执行权限，脚本内容如下

#!/bin/sed -f	#和bash一样指明解释器的路径
2,4a\			#2到4行追加 ‘\’仅仅表示此处换行追加文本					
we append a new line
5s/fox/cat/			#5行将fox替换为cat
1d					#删除第一行

[root@localhost sed]# vim sedscript
[root@localhost sed]# chmod u+x sedscript
[root@localhost sed]# ./sedscript example
2 white fox is looking at a white dog
we append a new line
3 white fox is looking at a white dog
we append a new line
4 white fox is looking at a white dog
we append a new line
5 white cat is looking at a white dog
#由结果看出上面的sed脚本执行成功，第一行删除，2到4行追加，第5行替换

-i选项

[root@localhost sed]# sed -i.bak 's/fox/cat/' example
[root@localhost sed]# ls
example  example.bak
[root@localhost sed]# cat example.bak
1 white fox is looking at a white dog
2 white fox is looking at a white dog
3 white fox is looking at a white dog
4 white fox is looking at a white dog
5 white fox is looking at a white dog
[root@localhost sed]# cat example
1 white cat is looking at a white dog
2 white cat is looking at a white dog
3 white cat is looking at a white dog
4 white cat is looking at a white dog
5 white cat is looking at a white dog
# -i.bak修改源文件并创建.bak副本 s/fox/cat替换全文的fox为cat

②sed文本定位的例子

[root@localhost sed]# cat example	#示例文本
1 Yellow fox is looking at a white dog
2 Red fox is looking at a white dog
3 Blue fox is looking at a white dog
4 white fox is looking at a white dog
5 green fox is looking at a white dog
[root@localhost sed]# sed -n '3p' example			#x
3 Blue fox is looking at a white dog
[root@localhost sed]# sed -n '2,4p' example			#x,y
2 Red fox is looking at a white dog
3 Blue fox is looking at a white dog
4 white fox is looking at a white dog
[root@localhost sed]# sed -n '/green/p' example		#/pattern/
5 green fox is looking at a white dog
[root@localhost sed]# sed -n '2,5!p' example		#x,y!
1 Yellow fox is looking at a white dog
[root@localhost sed]# sed -n '1,/Blue/p' example	#x,/pattern/
1 Yellow fox is looking at a white dog
2 Red fox is looking at a white dog
3 Blue fox is looking at a white dog

③sed编辑命令的例子

`i`插入文本

插入文本是在匹配行的前面插入一行

[root@localhost sed]# cat example
1 Yellow fox is looking at a white dog
2 Red fox is looking at a Red dog
3 Blue fox is looking at a white dog
4 white fox is looking at a white dog
5 green fox is looking at a white dog
[root@localhost sed]# sed  '2i\we append a new line' example	#在第二行之前追加新行
1 Yellow fox is looking at a white dog
we append a new line
2 Red fox is looking at a Red dog
3 Blue fox is looking at a white dog
4 white fox is looking at a white dog
5 green fox is looking at a white dog
[root@localhost sed]# sed  '/dog/i\we append a new line' example	#在包含dog行的前一行追加行
we append a new line
1 Yellow fox is looking at a white dog
we append a new line
2 Red fox is looking at a Red dog
we append a new line
3 Blue fox is looking at a white dog
we append a new line
4 white fox is looking at a white dog
we append a new line
5 green fox is looking at a white dog

`c`修改文本

修改文本是指将所有匹配的文本行利用新文本代替

[root@localhost sed]# sed  '2c\a new line' example	#第二行用新行代替
1 Yellow fox is looking at a white dog
a new line
3 Blue fox is looking at a white dog
4 white fox is looking at a white dog
5 green fox is looking at a white dog
[root@localhost sed]# sed  '/green/c\a new line' example	#含green的行用新行代替
1 Yellow fox is looking at a white dog
2 Red fox is looking at a Red dog
3 Blue fox is looking at a white dog
4 white fox is looking at a white dog
a new line
[root@localhost sed]#

`d`删除

可以删除指定行、指定范围行、包含某些字符串的行

[root@localhost sed]# sed  '2,3d' example	#删除2到3行
1 Yellow fox is looking at a white dog
4 white fox is looking at a white dog
5 green fox is looking at a white dog
[root@localhost sed]# sed  '2,/Blue/d' example	#删除2行到包含Blue的行
1 Yellow fox is looking at a white dog
4 white fox is looking at a white dog
5 green fox is looking at a white dog
[root@localhost sed]#

`s`替换

替换可以将匹配的文本利用新文本替换,替换的格式为：s/被替换的字符串/新字符串/[替换选项]

选项	含义
g	所有匹配到的字符串全被替换
p	与-n结合，指打印替换行
w filename	表示将输出定向到一个文件
n(数字)	范围1-512之间，表示替换某行中第n次匹配的字符串

[root@localhost sed]# cat example	#查看示例文本
1 dog Yellow fox is looking at a white dog
2 dog Red fox is looking at a Red dog
3 dog Blue fox is looking at a white dog
4 dog white fox is looking at a white dog
5 dog green fox is looking at a white dog
[root@localhost sed]# sed  '2,3s/dog/cat/' example	#2-3行的dog替换成cat
1 dog Yellow fox is looking at a white dog
2 cat Red fox is looking at a Red dog
3 cat Blue fox is looking at a white dog
4 dog white fox is looking at a white dog
5 dog green fox is looking at a white dog
[root@localhost sed]# sed  -n '2,3s/dog/cat/p' example	#p选项与上面对比，看出指打印了替换的行
2 cat Red fox is looking at a Red dog
3 cat Blue fox is looking at a white dog
————————————————————————————————————————————分割线——————————————————————————————————————————————————
[root@localhost sed]# sed 's/dog/cat/' example		#不加g选项，只替换了每行的第一个dog
1 cat Yellow fox is looking at a white dog
2 cat Red fox is looking at a Red dog
3 cat Blue fox is looking at a white dog
4 cat white fox is looking at a white dog
5 cat green fox is looking at a white dog	
[root@localhost sed]# sed 's/dog/cat/g' example		#加g选项，替换了文本中所有出现的dog
1 cat Yellow fox is looking at a white cat
2 cat Red fox is looking at a Red cat
3 cat Blue fox is looking at a white cat
4 cat white fox is looking at a white cat
5 cat green fox is looking at a white cat
[root@localhost sed]# sed  -e '3s/dog/cat/2' -e '4s/dog/fish/4' example	
#解释，第3行第二次匹配到的dog替换为cat，第4行第四次匹配到的dog替换为fish
1 dog Yellow fox is looking at a white dog dog dog
2 dog Red fox is looking at a Red dog   dog dog
3 dog Blue fox is looking at a white cat        dog dog
4 dog white fox is looking at a white dog       dog fish
5 dog green fox is looking at a white dog       dog dog
[root@localhost sed]#

`y`变换

将一系列的字符变换为相应的字符，格式sed 'y/被变换的字符序列/变换的字符序列/' inputfile 被变换的字符序列要和变换的字符序列等长

sed 'y/1234/abcd/' inputfile
# 1变换为a,2变换为b,3变换为为c，依次类推。

[root@localhost sed]# sed   '2y/adg/ADG/' example	#将第2行的所有小写'a''d''g'转换成大写的'A''D''G'
1 dog Yellow fox is looking at a white dog dog dog
2 DoG ReD fox is lookinG At A ReD DoG   DoG DoG
3 dog Blue fox is looking at a white dog        dog dog
4 dog white fox is looking at a white dog       dog dog
5 dog green fox is looking at a white dog       dog dog

常用的就介绍到这里