grep匹配与过滤 学习笔记-2

2月 24
Year 2009 小桥流水人家 Linux

grep提取含有IP的行

  1. root@debian:~# ifconfig eth0|grep "[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
  2. inet addr:192.168.0.4  Bcast:192.168.0.255  Mask:255.255.255.0
  1. root@debian:~# ifconfig eth0|grep -E "([0-9]{1,3}\.){3}[0-9]"
  2. inet addr:192.168.0.4  Bcast:192.168.0.255  Mask:255.255.255.0



禁止显示错误信息

  1. -s, --no-messages
  2. Suppress error messages about nonexistent or unreadable files.  Portability note:  unlike  GNU  grep,  traditional
  3. grep  did  not  conform to POSIX.2, because traditional grep lacked a -q option and its -s option behaved like GNU
  4. grep’s -q option.  Shell scripts intended to be portable to traditional grep should  avoid  both  -q  and  -s  and
  5. should redirect output to /dev/null instead.




将文件作为参数

  1. root@debian:~/cu# cat kk
  2. 123
  3. abc
  4. www-data
  5.  
  6. root@debian:~/cu# egrep -f kk /etc/passwd
  7. www-data:x:33:33:www-data:/var/www:/bin/sh
  8.  
  9. root@debian:~/cu# grep -E -f kk /etc/passwd
  10. www-data:x:33:33:www-data:/var/www:/bin/sh



“|” “与” “或”
输出有123或abc的行

  1. root@debian:~# echo -e 123"\n"abc"\n"AAA|grep -E "123|AAA"
  2. 123
  3. AAA



关键字高亮 –color

  1. root@debian:~# echo -e 123"\n"abc"\n"AAA|grep -E "123|AAA" --color
  2. 123
  3. AAA


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6 Comments

  1. 子曰 On 2月 24th, 2009 / #1 Reply

    囧，我也不懂，有钱途～～