标签：扩展 格式 php_eol nbsp 表达 nic 表达式 eol pat
作用：从文本文件或管道数据流中筛选匹配的行及数据，配合正则表达式一起使用，功能更加强大。
格式:
grep [options] [pattern] [file]
１，匹配包含"ghostwu"的行
ghostwu@dev:~/linux/grep$ cat -n ghostwu.txt 1 my name is ghostwu 2 how are you 3 fine think you 4 My name is Ghostwu 5 what‘s your name? 6 my name is ghostwu2 7 ghostwu@dev:~/linux/grep$ grep "ghostwu" ghostwu.txt my name is ghostwu my name is ghostwu2
２，-v: 不包含，相当于取反
ghostwu@dev:~/linux/grep$ grep -v "ghostwu" ghostwu.txt how are you fine think you My name is Ghostwu what‘s your name? ghostwu@dev:~/linux/grep$
３，-n 添加行号
ghostwu@dev:~/linux/grep$ grep -n "ghostwu" ghostwu.txt 1:my name is ghostwu 6:my name is ghostwu2 ghostwu@dev:~/linux/grep$ grep -vn "ghostwu" ghostwu.txt 2:how are you 3:fine think you 4:My name is Ghostwu 5:what‘s your name? 7:
４，-E，使用扩展的egrep命令，模式中可以用正则表达式
ghostwu@dev:~/linux/grep$ cat ghostwu.txt my name is ghostwu how are you fine think you My name is Ghostwu what‘s your name? my name is ghostwu2 ghostwu@dev:~/linux/grep$ grep -E "my|your" ghostwu.txt my name is ghostwu what‘s your name? my name is ghostwu2 ghostwu@dev:~/linux/grep$ grep -Ev "my|your" ghostwu.txt how are you fine think you My name is Ghostwu ghostwu@dev:~/linux/grep$ grep -En "my|your" ghostwu.txt 1:my name is ghostwu 5:what‘s your name? 6:my name is ghostwu2
５，-i选项，不区分大小写
ghostwu@dev:~/linux/grep$ grep "ghostwu" ghostwu.txt my name is ghostwu my name is ghostwu2 ghostwu@dev:~/linux/grep$ grep -i "ghostwu" ghostwu.txt my name is ghostwu My name is Ghostwu my name is ghostwu2
６，-c :统计匹配的行数，不是匹配字符串的次数
ghostwu@dev:~/linux/grep$ grep -c "ghostwu" ghostwu.txt 2 ghostwu@dev:~/linux/grep$ grep -ci "ghostwu" ghostwu.txt 3
ghostwu@dev:~/linux/grep$ grep -c "ghostwu" ghostwu.txt 2 ghostwu@dev:~/linux/grep$ grep "ghostwu" ghostwu.txt my name is ghostwu, nice to meet you,ghostwu my name is ghostwu2 ghostwu@dev:~/linux/grep$ cat -n ghostwu.txt 1 my name is ghostwu, nice to meet you,ghostwu 2 how are you 3 fine think you 4 My name is Ghostwu 5 what‘s your name? 6 my name is ghostwu2 7
７，-o: 只输出匹配到的字符串
ghostwu@dev:~/linux/grep$ grep -o "ghostwu" ghostwu.txt ghostwu ghostwu ghostwu@dev:~/linux/grep$ grep -oi "ghostwu" ghostwu.txt ghostwu Ghostwu ghostwu
８，-w: 只匹配过滤的单词，类似于精确匹配
ghostwu@dev:~/linux/grep$ grep -w "ghostwu" ghostwu.txt my name is ghostwu, nice to meet you,ghostwu ghostwu@dev:~/linux/grep$ grep -wi "ghostwu" ghostwu.txt my name is ghostwu, nice to meet you,ghostwu My name is Ghostwu ghostwu@dev:~/linux/grep$ cat -n ghostwu.txt 1 my name is ghostwu, nice to meet you,ghostwu 2 how are you 3 fine think you 4 My name is Ghostwu 5 what‘s your name? 6 my name is ghostwu2 7
９，常用的一招小技巧，去除文件的注释和空行，在运维中，可以用这条命令把配置文件的空行和注释去掉，然后用管道生成。这样配置文件比较容易查看和配置
ghostwu@dev:~/linux/grep$ grep -Ev "^$|#" ghostwu.php <?php class Person { public $name = ‘ghostwu‘; public $age = 20; public function showinfo(){ echo $this->name . PHP_EOL; echo $this->age. PHP_EOL; } } ghostwu@dev:~/linux/grep$ cat -n ghostwu.php 1 <?php 2 3 class Person { 4 5 #人名 6 public $name = ‘ghostwu‘; 7 8 #年龄 9 public $age = 20; 10 11 #显示信息 12 public function showinfo(){ 13 echo $this->name . PHP_EOL; 14 echo $this->age. PHP_EOL; 15 } 16 }
Linux常用基本命令:grep-从文件或者管道中筛选匹配的行
标签：扩展 格式 php_eol nbsp 表达 nic 表达式 eol pat
原文地址：https://www.cnblogs.com/ghostwu/p/9065548.html
