33 lines
1.7 KiB
Markdown
33 lines
1.7 KiB
Markdown
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- --color=auto 添加色彩 alias grep='grep --color=auto'
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- -n 打印包含关键字的行号 `grep -n root /etc/passwd`
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- -i 忽略大小写匹配
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- grep '^root' /etc/passwd 以 root 开头
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- grep 'bash$' /etc/passwd 以 bash 结尾
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- -v 取反，grep -v '^root' /etc/passwd 不以 root 开头的文件
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- -A 搜索值的后几行连同展示 grep -niA "^root" /etc/passwd 
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- -B 搜索行的前几行连同展示 
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- -w 按照单词搜索，包含单词的行 grep -w "hello" /etc/passwd 
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- -o 只打印关键字本身
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- 过滤空行 grep -v '^$' 1.txt
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- -E 使用扩展正则 `grep -E 'A[0-9]{3}' 1.txt`
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```
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me@me-EQ59:~/shell_demo$ ifconfig enp2s0 # 取出 ip 子网掩码 和 网关地址
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enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
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inet 192.168.110.2 netmask 255.255.255.0 broadcast 192.168.110.255
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inet6 fe80::eedd:38e2:edd:f678 prefixlen 64 scopeid 0x20<link>
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ether 7c:83:34:b4:b0:a3 txqueuelen 1000 (以太网)
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RX packets 178803597 bytes 90913766807 (90.9 GB)
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RX errors 0 dropped 9947 overruns 0 frame 0
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TX packets 177733548 bytes 81380631943 (81.3 GB)
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TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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me@me-EQ59:~/shell_demo$ ifconfig enp2s0 | grep -oE "([0-9]{1,3}\.){3}[0-9]{1,3}"
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192.168.110.2
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255.255.255.0
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192.168.110.255
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me@me-EQ59:~/shell_demo$ ifconfig enp2s0 | grep -oP "(\d{1,3}\.){3}\d{1,3}"
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192.168.110.2
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255.255.255.0
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192.168.110.255
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me@me-EQ59:~/shell_demo$
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```
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