为什么空行没有存储在变量中 [英] why empty line is not getting stored in variable

问题描述

我正在使用以下代码

    #! /bin/bash
for host in $(cat ./server.txt)
do 
    echo "$host"

done

server.txt包含:

server.txt contains :

     server1.com
     server2.com

     server3.com


     server4.com

但是上面的代码给出了以下输出:

But the above code is giving below output:

     server1.com
     server2.com
     server3.com
     server4.com

即它没有考虑空行.我该如何解决?

i.e its not taking account of empty lines.How can I fix that?

推荐答案

while read host; do echo "$host"; done < server.txt

使用您提供的代码，将文件作为单个字符串作为for命令的第4个参数给出.然后，shell使用任意空格作为分隔符来分隔字符串 (假设您尚未更改IFS变量).

With the code you provided, the file as a single string is given as the 4th argument to the for command. The shell then splits the string using arbitrary whitespace as a delimiter (assuming you have not altered the IFS variable).

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