引數：

• -i: 不區分大小寫
• -c: 統計包含匹配的行數
• -n: 輸出行號
• -v: 反向匹配

示例檔案： (example.txt)

The cat's name is Tom, what's the mouse's name?

The mouse's NAME is Jerry

They are good friends

1、找出包含name的行

# 等價於 cat example.txt | grep 'name'

grep 'name' example.txt

# 輸出

The cat's name is Tom, what's the mouse's name?

預設grep搜尋是區分大小寫的，所以搜尋name時只搜尋到name所在的第一行，第二行大寫的NAMW沒有匹配到。

2、忽略搜尋內容大小寫

# 等價於 cat example.txt | grep -i 'name'

grep -i 'name' example.txt

# 輸出

The cat's name is Tom, what's the mouse's name?

The mouse's NAME is Jerry

3、統計搜尋內容行數

# 等價於 cat example.txt | grep -c 'name'

grep -c 'name' example.txt

# 輸出

1

# 等價於 cat example.txt | grep -ci 'name'

grep -ci 'name' example.txt

# 輸出
 

2

4、搜尋除指定字元所在行的其他內容

# 等價於 cat example.txt | grep -v 'name'

grep -v 'name' example.txt

# 輸出

The mouse's NAME is Jerry

They are good friends