上传文件至 'Shell-MD'
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@ -509,7 +509,113 @@ root
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egrep: 扩展的egrep，支持更多的正则表达式元字符
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fgrep: 固定grep(fixed grep)，有时也被称作快速(fast grep)，它按字面解释所有的字符(了解)
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#### 2.语法格式
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```shell
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grep [选项] PATTERN filename filename ...
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```
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案例：
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```shell
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[root@xingdiancloud ~]# grep 'Tom' /etc/passwd
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[root@xingdiancloud ~]# grep 'bash shell' /etc/test
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```
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注意：
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找到： grep返回的退出状态为0
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没找到： grep返回的退出状态为1
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找不到指定文件： grep返回的退出状态为2
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来自标准输入或管道：
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```shell
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[root@xingdiancloud ~]# ps aux |grep 'sshd'
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[root@xingdiancloud ~]# ll |grep '^d'
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[root@xingdiancloud ~]# grep 'alice' /etc/passwd /etc/shadow /etc/group
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```
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#### 2.使用元字符
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```shell
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grep: 使用基本元字符集 ^, $, ., *, [], [^], \< \>,\(\),\{\}, \+, \|
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egrep(或grep -E): 使用扩展元字符集 ?, +, { }, |, ( )
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注：grep也可以使用扩展集中的元字符，仅需要对这些元字符前置一个反斜线
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\w 所有字母与数字，称为字符[a-zA-Z0-9] 'l[a-zA-Z0-9]*ve' 'l\w*ve'
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\W 所有字母与数字之外的字符，称为非字符 'love[^a-zA-Z0-9]+' 'love\W+'
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\b 词边界 '\<love\>' '\blove\b'
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```
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#### 3.grep示例
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```shell
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[root@xingdiancloud ~]# egrep 'N\W' datafile
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[root@xingdiancloud ~]# egrep '^n' datafile
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[root@xingdiancloud ~]# egrep '4$' datafile
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[root@xingdiancloud ~]# egrep '5\..' datafile
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[root@xingdiancloud ~]# egrep '\.5' datafile
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[root@xingdiancloud ~]# egrep '^[we]' datafile
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[root@xingdiancloud ~]# egrep '[^0-9]' datafile
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[root@xingdiancloud ~]# egrep '[A-Z][A-Z] [A-Z]' datafile
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[root@xingdiancloud ~]# egrep 'ss* ' datafile
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[root@xingdiancloud ~]# egrep '[a-z]{9}' datafile
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[root@xingdiancloud ~]# egrep '\<north' datafile
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[root@xingdiancloud ~]# egrep '\<north\>' datafile
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[root@xingdiancloud ~]# egrep '\<[a-r].*n\>' datafile
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[root@xingdiancloud ~]# egrep '^n\w*\W' datafile
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[root@xingdiancloud ~]# egrep '\bnorth\b' datafile
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[root@xingdiancloud ~]# egrep '3+' datafile
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[root@xingdiancloud ~]# egrep '2\.?[0-9]' datafile
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[root@xingdiancloud ~]# egrep '(no)+' datafile
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[root@xingdiancloud ~]# egrep 'S(h|u)' datafile
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```
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#### 4.grep参数
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```shell
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-i, --ignore-case 忽略大小写
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-l, --files-with-matches 只列出匹配行所在的文件名
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-n, --line-number 在每一行前面加上它在文件中的相对行号
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-c, --count 显示成功匹配的行数
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-s, --no-messages 禁止显示文件不存在或文件不可读的错误信息
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-q, --quiet, --silent 静默--quiet, --silent
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-v, --invert-match 反向查找，只显示不匹配的行
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-R, -r, --recursive 递归针对目录
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--color 颜色
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-o, --only-matching 只显示匹配的内容
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```
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示例：
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```shell
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[root@xingdian ~]# grep -R 'ifcfg' /etc 目录
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[root@xingdian ~]# egrep 'root' /etc/passwd /etc/shadow /etc/hosts
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/etc/passwd:root:x:0:0:root:/root:/bin/bash
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/etc/passwd:operator:x:11:0:operator:/root:/sbin/nologin
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/etc/shadow:root:$6$gcO6Vp4t$OX9LmVgpjtur67UQdUYfw7vJW.78.uRXCLIxw4mBk82Z99:7:::
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[root@xingdian ~]# egrep -l 'root' /etc/passwd /etc/shadow /etc/hosts
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/etc/passwd
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/etc/shadow
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[root@xingdian ~]# egrep -n 'root' /etc/passwd /etc/shadow /etc/hosts
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/etc/passwd:1:root:x:0:0:root:/root:/bin/bash
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/etc/passwd:11:operator:x:11:0:operator:/root:/sbin/nologin
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/etc/shadow:1:root:$6$gcO6Vp4t$OX9LmVgpjtur67UQdUy8.M78.uRXCLIxw4mBk82ZrNlxyf54
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[root@xingdian ~]# egrep -R '54:04:A6:CE:C2:1F' /etc/sysconfig/
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[root@xingdian ~]# egrep '^IPADDR' /etc/sysconfig/network-scripts/ifcfg-eth0 |egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
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192.168.2.254
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[root@xingdian ~]# egrep '^IPADDR' /etc/sysconfig/network-scripts/ifcfg-eth0 |egrep -o '([0-9]{1,3}\.){3}[0-9]{1,3}'
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192.168.2.254
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```
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50
Shell-MD/shell脚本案例.md
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50
Shell-MD/shell脚本案例.md
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@ -0,0 +1,50 @@
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<h1><center>shell脚本案例</center></h1>
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作者：行癫（盗版必究）
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------
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## 一：脚本案例
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#### 1.配置静态IP案例
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```shell
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#!/bin/bash
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# This script configures a static IP address on CentOS 7
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# Define variables for the IP address, netmask, gateway, and DNS servers
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IP_ADDRESS=192.168.1.100
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NETMASK=255.255.255.0
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GATEWAY=192.168.1.1
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DNS_SERVERS="8.8.8.8 114.114.114.114"
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# Backup the original network configuration file
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cp /etc/sysconfig/network-scripts/ifcfg-ens33 /etc/sysconfig/network-scripts/ifcfg-ens33.bak
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# Modify the network configuration file with the static IP address, netmask, gateway, and DNS servers
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cat << EOF > /etc/sysconfig/network-scripts/ifcfg-ens33
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TYPE=Ethernet
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BOOTPROTO=none
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NAME=ens33
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DEVICE=ens33
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ONBOOT=yes
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IPADDR=$IP_ADDRESS
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NETMASK=$NETMASK
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GATEWAY=$GATEWAY
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DNS1=${DNS_SERVERS%% *}
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DNS2=${DNS_SERVERS##* }
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EOF
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# Restart the network service to apply the changes
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systemctl restart network
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# Display the new network configuration
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ip addr show ens33
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```
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centos stream 9
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```
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```
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