本篇内容介绍了“shell read命令怎么用”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
shell作为一门语言，自然也具有读数据的功能，read就是按行从文件(或标准输入或给定文件描述符)中读取数据的最佳选择。当使用管道、重定向方式组合命令时感觉达不到自己的需求时，不妨考虑下while read line。
1、read基本读取
1 #!/bin/bash 2 #testing the read command 3 4 echo -n "Enter you name:" #echo -n 让用户直接在后面输入 5 read name #输入的多个文本将保存在一个变量中 6 echo "Hello $name, welcome to my program." 执行：# ./read.shEnter you name: wangtaoHello wangtao, welcome to my program.2、read -p （直接在read命令行指定提示符）
1 #!/bin/bash 2 #testing the read -p option 3 read -p "Please enter your age: " age 4 days=$[ $age * 365 ] 5 echo "That makes you over $days days old!"执行：# ./age.shPlease enter your age: 23That makes you over 8395 days old!3、read -p （指定多个变量）
1 #!/bin/bash 2 # entering multiple variables 3 4 read -p "Enter your name:" first last 5 echo "Checking data for $last, $first"执行：# ./read1.shEnter your name: a bChecking data for b, a4、read 命令中不指定变量，那么read命名将它收到的任何数据都放在特殊环境变量REPLY中
1 #!/bin/bash 2 # testing the REPLY environment variable 3 4 read -p "Enter a number: " 5 factorial=1 6 for (( count=1; count$REPLY; count++ )) 7 do 8 factorial=$[ $factorial * $count ] #等号两端不要有空格 9 done10 echo "The factorial of $REPLY is $factorial"执行：./read2.shEnter a number: 6The factorial of 6 is 7205、超时, 等待输入的秒数（read -t）
1 #!/bin/bash 2 # timing the data entry 3 4 if read -t 5 -p "Please enter your name: " name #记得加-p参数， 直接在read命令行指定提示符 5 then 6 echo "Hello $name, welcome to my script" 7 else 8 echo 9 echo "Sorry, too slow!"10 fi执行：# ./read3.shPlease enter your name:Sorry, too slow!# ./read3.shPlease enter your name: wangHello wang, welcome to my script6、read命令对输入的字符判断
1 #!/bin/bash 2 # getting just one character of input 3 4 read -n1 -p "Do you want to continue [Y/N]? " answer 5 case $answer in 6 Y | y) echo 7 echo "fine, continue on...";; 8 N | n) echo 9 echo "OK, goodbye"10 exit;;11 esac 执行：# ./read4.shDo you want to continue [Y/N]? yfine, continue on..../read4.shDo you want to continue [Y/N]? nOK, goodbye7、隐藏方式读取（read -s）
1 #!/bin/bash 2 # hiding input data from the monitor 3 4 read -s -p "Enter your passwd: " pass #-s 参数使得read读入的字符隐藏 5 echo 6 echo "Is your passwd readlly $pass?"~ 执行：# ./read5.shEnter your passwd:Is your passwd readlly osfile@206?8、从文本中读取
1 #!/bin/bash 2 # reading data from a file 3 4 count=1 5 cat test | while read line 6 do 7 echo "Line $count: $line" 8 count=$[ $count + 1 ] 9 done10 echo "Finished processing the file"执行：./read6.shLine 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“shell read命令怎么用”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注编程网网站，小编将为大家输出更多高质量的实用文章！
