turn from: http://151wqooo.blog.51cto.com/2610898/1162118

If you want to find “Hello, World!” String in the current directory, you can do this:

grep -rn “hello,world!” *

*: Represents all files in the current directory, or it can also be a file name

-r is recursive search

-N is a display line number

-R Find all files include subdirectory

-I Llelacule

The following is some interesting command line parameters:

GREP -i Pattern Files: Search for a small and lowercase. By default, distinguishment of cowlash,

GREP -L Pattern Files: Only list the matching file name,

Grep -l Pattern Files: List the name name that does not match,

GREP -W Pattern Files: Only match the entire word instead of a part of the string (such as matching ‘Magic’, not ‘Magical’),

GREP -C Number Pattern Files: The matching context displays [Number] line respectively,

Grep Pattern1 | Pattern2 Files: Show the line that matches Pattern1 or Pattern2,

GREP Pattern1 Files | Grep Pattern2: Show the line that matches both pattern1 and Pattern2.

Here are some special symbols for search:

\ <and \> The start and end of the words are marked respectively.

For example:

GREP Man * will match ‘Batman’, ‘Manic’, ‘Man’, etc.

GREP ‘\ <Man’ * matching ‘manic’ and ‘man’, but not ‘Batman’,

GREP ‘\ <Man \>’ Only matching ‘man’, not other string such as ‘Batman’ or ’Manic’.

‘^’: The matching string is at the beginning of the line,

‘$’: The matching string is at the tail,

2, XARGS cooperate with GRP search

find -type f -name ‘*.php’|xargs grep ‘GroupRecord’