shell script中read的用法

1、read基本讀取

#!/bin/bash #testing the read command echo -n "enter you name:" #echo -n 讓使用者直接在後面輸入 read name #輸入的多個文字將儲存在乙個變數中

echo "hello $name, welcome to my progra

執行：

# ./read.sh enter you name: yuan

hello yuan, welcome to my program

2、read -p (直接在read命令列指定提示符)

#!/bin/bash #testing the read -p option read -p "please enter your age: " age days=$[ $age * 365 ]

echo "that makes you over $days days old!"

3、read -p（指定多個變數）

#!/bin/bash # entering multiple variables read -p "enter your name:" first last

echo "checking data for $last, $first"

執行：

# ./read1.sh enter your name: a b

checking data for b, a

4、超時、等待輸入的秒數（read -t）

#!/bin/bash # timing the data entry if read -t 5 -p "please enter your name: " name #記得加-p引數，直接在read命令列指定提示符 then echo "hello $name, welcome to my script" else echo echo "sorry, too slow!"

fi

執行：

# ./read3.sh please enter your name: sorry, too slow! # ./read3.sh please enter your name: wang

hello wang, welcome to my script

4、read命令對於輸入字元的判斷

#!/bin/bash
read -p "please input(y/n):" yn
[ "$yn" == "y" -o "$yn" == "y" ]&&echo  "ok,continue"&&exit 0
[ "$yn" == "n" -o "$yn" == "n" ]&&echo "oh,interrupt!"&&exit 0
echo "i don't konw what your choice is"&&exit 0

5、執行

yuanqiangfei@ubuntu:~/script$ ./sh01.sh 
please input(y/n):y
ok,continue
yuanqiangfei@ubuntu:~/script$ ./sh01.sh 
please input(y/n):n
oh,interrupt!

6、隱藏方式讀取（read -s）

#!/bin/bash
#entering muiltple variables
while true
do        read -s -p "please enter your password:"  passwd
[ "$passwd" == "123456" ]&&echo "password is right!"&&exit 0
[ "$passwd" != "123456" ]&&echo "password is not right,please input again!"&&continue
done

執行：

yuanqiangfei@ubuntu:~/script$ ./read.sh please enter your password:password is right! yuanqiangfei@ubuntu:~/script$ ./read.sh please enter your password:password is not right,please input again!

please enter your password:

7、從文字中讀取

#!/bin/bash
# reading data from a file
count=1
cat test | while read line
do   echo "line $count: $line"
count=$[ $count + 1 ]
done
echo "finished processing the file"

執行結果：

./read6.sh line 1: the quick brown dog jumps over the lazy fox. line 2: this is a test, this is only a test. line 3: o romeo, romeo! wherefore art thou romeo?

finished processing the file

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