上传文件至 'Shell-MD'

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diandian 1 year ago
parent 89a332b719
commit 6234f76c10

@ -509,7 +509,113 @@ root
egrep: 扩展的egrep支持更多的正则表达式元字符
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)
#### 2.语法格式
```shell
grep [选项] PATTERN filename filename ...
```
案例:
```shell
[root@xingdiancloud ~]# grep 'Tom' /etc/passwd
[root@xingdiancloud ~]# grep 'bash shell' /etc/test
```
注意:
找到: grep返回的退出状态为0
没找到: grep返回的退出状态为1
找不到指定文件: grep返回的退出状态为2
来自标准输入或管道:
```shell
[root@xingdiancloud ~]# ps aux |grep 'sshd'
[root@xingdiancloud ~]# ll |grep '^d'
[root@xingdiancloud ~]# grep 'alice' /etc/passwd /etc/shadow /etc/group
```
#### 2.使用元字符
```shell
grep: 使用基本元字符集 ^, $, ., *, [], [^], \< \>,\(\),\{\}, \+, \|
egrep(或grep -E): 使用扩展元字符集 ?, +, { }, |, ( )
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
\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'
\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+'
\b 词边界 '\<love\>' '\blove\b'
```
#### 3.grep示例
```shell
[root@xingdiancloud ~]# egrep 'N\W' datafile
[root@xingdiancloud ~]# egrep '^n' datafile
[root@xingdiancloud ~]# egrep '4$' datafile
[root@xingdiancloud ~]# egrep '5\..' datafile
[root@xingdiancloud ~]# egrep '\.5' datafile
[root@xingdiancloud ~]# egrep '^[we]' datafile
[root@xingdiancloud ~]# egrep '[^0-9]' datafile
[root@xingdiancloud ~]# egrep '[A-Z][A-Z] [A-Z]' datafile
[root@xingdiancloud ~]# egrep 'ss* ' datafile
[root@xingdiancloud ~]# egrep '[a-z]{9}' datafile
[root@xingdiancloud ~]# egrep '\<north' datafile
[root@xingdiancloud ~]# egrep '\<north\>' datafile
[root@xingdiancloud ~]# egrep '\<[a-r].*n\>' datafile
[root@xingdiancloud ~]# egrep '^n\w*\W' datafile
[root@xingdiancloud ~]# egrep '\bnorth\b' datafile
[root@xingdiancloud ~]# egrep '3+' datafile
[root@xingdiancloud ~]# egrep '2\.?[0-9]' datafile
[root@xingdiancloud ~]# egrep '(no)+' datafile
[root@xingdiancloud ~]# egrep 'S(h|u)' datafile
```
#### 4.grep参数
```shell
-i, --ignore-case 忽略大小写
-l, --files-with-matches 只列出匹配行所在的文件名
-n, --line-number 在每一行前面加上它在文件中的相对行号
-c, --count 显示成功匹配的行数
-s, --no-messages 禁止显示文件不存在或文件不可读的错误信息
-q, --quiet, --silent 静默--quiet, --silent
-v, --invert-match 反向查找,只显示不匹配的行
-R, -r, --recursive 递归针对目录
--color 颜色
-o, --only-matching 只显示匹配的内容
```
示例:
```shell
[root@xingdian ~]# grep -R 'ifcfg' /etc 目录
[root@xingdian ~]# egrep 'root' /etc/passwd /etc/shadow /etc/hosts
/etc/passwd:root:x:0:0:root:/root:/bin/bash
/etc/passwd:operator:x:11:0:operator:/root:/sbin/nologin
/etc/shadow:root:$6$gcO6Vp4t$OX9LmVgpjtur67UQdUYfw7vJW.78.uRXCLIxw4mBk82Z99:7:::
[root@xingdian ~]# egrep -l 'root' /etc/passwd /etc/shadow /etc/hosts
/etc/passwd
/etc/shadow
[root@xingdian ~]# egrep -n 'root' /etc/passwd /etc/shadow /etc/hosts
/etc/passwd:1:root:x:0:0:root:/root:/bin/bash
/etc/passwd:11:operator:x:11:0:operator:/root:/sbin/nologin
/etc/shadow:1:root:$6$gcO6Vp4t$OX9LmVgpjtur67UQdUy8.M78.uRXCLIxw4mBk82ZrNlxyf54
[root@xingdian ~]# egrep -R '54:04:A6:CE:C2:1F' /etc/sysconfig/
[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}'
192.168.2.254
[root@xingdian ~]# egrep '^IPADDR' /etc/sysconfig/network-scripts/ifcfg-eth0 |egrep -o '([0-9]{1,3}\.){3}[0-9]{1,3}'
192.168.2.254
```

@ -0,0 +1,50 @@
<h1><center>shell脚本案例</center></h1>
作者:行癫(盗版必究)
------
## 一:脚本案例
#### 1.配置静态IP案例
```shell
#!/bin/bash
# This script configures a static IP address on CentOS 7
# Define variables for the IP address, netmask, gateway, and DNS servers
IP_ADDRESS=192.168.1.100
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS_SERVERS="8.8.8.8 114.114.114.114"
# Backup the original network configuration file
cp /etc/sysconfig/network-scripts/ifcfg-ens33 /etc/sysconfig/network-scripts/ifcfg-ens33.bak
# Modify the network configuration file with the static IP address, netmask, gateway, and DNS servers
cat << EOF > /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
BOOTPROTO=none
NAME=ens33
DEVICE=ens33
ONBOOT=yes
IPADDR=$IP_ADDRESS
NETMASK=$NETMASK
GATEWAY=$GATEWAY
DNS1=${DNS_SERVERS%% *}
DNS2=${DNS_SERVERS##* }
EOF
# Restart the network service to apply the changes
systemctl restart network
# Display the new network configuration
ip addr show ens33
```
centos stream 9
```
```
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