read 内部命令被用来从标准输入读取单行数据。这个命令可以用来读取键盘输入,当使用重定向的时候,可以读取文件中的一行数据。
FILE=sample.txt # Wrong way to read the file. # This may cause problem, check the value of'i'at theendof the loop echo"###" cat$FILE|whileread line;do echo"Line # $i: $line" ((i++)) done echo"Total number of lines in file: $i" # The worst way to read file. echo"##...
This article is all about how to read files in bash scripts using awhile loop. Reading a file is a common operation in programming. You should be familiar with different methods and which method is more efficient to use. In bash, a single task can be achieved in many ways but there is...
$ type -a echoecho is shell builtinecho is /usr/bin/echoecho is /bin/echo 上面代码表示,echo命令即是内置命令,也有对应的外部程序。 type命令的-t参数,可以返回一个命令的类型:别名(alias),关键词(keyword),函数(function),内置命令(builtin)和文件(file)。 $ type -t bash file $ type -t if k...
read:询问用户的输入 read 命令允许您从用户那里获取输入并将其存储在变量中。 代码语言:txt AI代码解释 #!/usr/bin/env bash echo "What is your name?" read name echo "Your name is ${name}!" 这将等待您(用户)的输入,然后将name变量的值设置为您输入的字符串。
/bin/bashnlines=$(wc -l <$1)echo"There are$nlineslines in$1" 1. 2. 我们去掉了第一个脚本中的 read 命令和第一个 echo 命令,这样脚本看起来更加简洁。 这样,在运行脚本的时候,可以将文件名作为参数传递: 复制 ./count_lines.sh /etc/groupThere are73linesin/etc/group...
/bin/bash while read line do echo $line done < filename(待读取的文件) ---... 胡.杰 0 385 shell读取文件的每一行 2013-11-26 12:35 −shell读取文件的每一行 写法一: --- #!/bin/bash while read line do &nbs... wangicter的博客 0 236 Shell 读取文本内容 2015-11-25 23:36 −...
60:echo ${colors[@]}# 再次列出数组内容, 内容为空. 61: 62:exit 0 63: 注意:管道输出到read命令中, 使用管道echo输出来设置变量将会失败. 然而, 使用管道cat输出看起来能够正常运行. 1 cat file1 file2 | 2 while read line 3 do 4 echo $line 5 done...
read name if [ $name ] echo“Hello $name” else echo“Must’ve been my imagination” fi 在终端中: ~$bash name.sh Who is there? ~$ Must’ve been my imagination 如何在 Bash 中创建备份管理脚本 其他需要考虑的项目包括设置备份管理脚本。这可以是一个简单的项目,可以开始并在以后重新访问。有了...
#use what we learned in a script. #Let's get some information from the user and add it to our scripts with stanard input and read echo "What is your name? " read name #Here standard output directed to append a file to learnToScirptStandardOutput ...