Shell中read的用法詳解

read的常用用法如下:

read -[ps***] var1 var2 ...

-p 提示語句

-n字元個數

-s遮蔽回顯

-t等待時間

-d輸入分界

01). read # 從標準輸入讀取一行並賦值給特定變數reply root@linux~# read hello,world! root@linux~# echo $reply hello,world! 02). read name # 從標準輸入讀取輸入並賦值給變數name root@linux~# read name jerry root@linux~# echo $name jerry 03). read var1 var2 # 第乙個變數放置於var1,第二個變數放到var2 root@linux~# read firstname lastname jerry gao root@linux~# echo "firstname:$firstname lastname:$lastname" firstname:jerry lastname:gao 04). read -p "text" # 列印提示'text'，等待輸入，並將輸入儲存在reply中 root@linux~# read -p 'please enter your name:-->' please enter your name:-->jerry root@linux~# echo $reply jerry 05). read -p "text" var # 列印提示'text'，等待輸入，並將輸入儲存在var中 root@linux~# read -p 'please enter your name:-->' name please enter your name:-->jerry root@linux~# echo $name jerry 06). read -p "text" var1 var2 # 列印提示'text'，等待輸入，將變數分別儲存在var1,var2... root@linux~# read -p 'what your name? ' firstname lastname what your name? jerry gao root@linux~# echo "firstname:$firstname lastname:$lastname" firstname: jerry lastname:gao 07). read -r line # 允許輸入包含反斜槓 root@linux~# read line # 不帶-r引數；則反斜槓不顯示 this is line 1. \ this is line 2. root@linux~# echo $line this is line 1. this is line 2. root@linux~# read -r line # 帶-r引數；則反斜槓正常顯示顯示 this is line 1. \ this is line 2. root@linux~# echo $line this is line 1. \ this is line 2. 08). read -t 5 # 指定讀取等待時間為5秒 root@linux~# read -t 5 -p 'your name:' name your name:jerry root@linux~# echo $name # 如果5秒還未輸入，則不能輸入 jerry 09). read -a arrayname # 把單詞清單讀入arrayname的陣列裡 root@linux~# read -a citys bj sh cd gz root@linux~# echo $ bj sh cd gz root@linux~# echo $ bj10). read -s -p "pwd：" pwd # 使用-s引數可以不顯示使用者的輸入 root@linux~# read -p "enter your password:" -s password enter your password: root@linux~# root@linux~# echo $password # 剛才輸入的密碼為:1234 1234 11). read -n 1 -p "sure?(y/n)：" # 使用-n，來確定引數個數 root@linux~# read -n 1 -p "are you sure?(y/n): " answer are you sure?(y/n): y root@linux~# root@linux~# echo -e "your answer is: $answer" your answer is: y 12). read -d ":" var # 使用:作為輸入分界符 root@linux~# read -d ";" -p "enter your name:" name enter your name:jerry gao; root@linux~# echo -e "your name: $name"

your name: jerry gao

read在指令碼中的應用:

遍歷方式一：

#!/bin/bash
count=0
while read line
do    echo -e "$count:-->$line"
count=$[ count + 1]
done < /etc/passwd

遍歷方式二：

#!/bin/bash
awk -f: '' /etc/passwd | while read user bash
do    echo -e "user=$user; bash=$bash"
done

Shell中read的用法詳解

Shell中read的選項及用法

Shell中read的選項及用法

shell指令碼 read用法

Shell中read的用法詳解

Shell中read的選項及用法

Shell中read的選項及用法

shell指令碼 read用法

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