linux命令---查找文件中的内容

[yang@localhost ~]$ cat 1.txt |egrep ‘123456789|second‘-------匹配123456789或者second的行

first line:123456789012345678901234567890123456789012345678901234567890

second line:one two three four five six seven eight nine ten

[yang@localhost ~]$ cat 1.txt |egrep ‘two‘ |egrep ‘one‘----匹配two 且匹配one的行

second line:one two three four five six seven eight nine ten

[yang@localhost ~]$ cat 1.txt |grep ‘two‘ |grep ‘one‘----匹配two 且匹配one的行

second line:one two three four five six seven eight nine ten

[yang@localhost ~]$ grep -o 123456789 1.txt |wc -l  -----123456789出现的次数

6

[yang@localhost ~]$ cat 1.txt |grep -o 123456789 |wc -l    -----123456789出现的次数

6

[yang@localhost ~]$ more 1.txt |grep -o 123456789 |wc -l  -----123456789出现的次数

6

[yang@localhost ~]$

[yang@localhost ~]$ more 1.txt |grep -o ‘one..........two‘ |wc -l   -----------‘one..........two‘出现的次数，中间10个点表示隔了10个字

1

[yang@localhost ~]$ cat -n 1.txt |grep ‘one..........two‘      ----------匹配‘one..........two‘的行，中间10个点表示隔了10个字

    53     one1234567890two

[yang@localhost ~]$