exec 6 <data # create a file handler while read line 0<&6 do printf "$linen" done exec 6<&- # close file 2. Read and parse each line while read x y do echoxxy done <data 3.Read a file with user-specified delimiter e.g. (file name: data) A:0 B:1 C:2 IFS=: # set d...
while read -r line; do COMMAND; done < input.file 通过-r 选项传递给 read 命令以防止阻止解释其中的反斜杠转义符。 在read 命令之前添加 IFS= 选项,来防止首尾的空白字符被去掉。 while IFS= read -r line; do COMMAND_on $line; done < input.file 这是更适合人类阅读的语法: #!/bin/bash input...
read-d":"user_name user_ageecho"Hello,$user_name! You are$user_ageyears old." 使用-u选项从文件描述符读取数据: 代码语言:bash 复制 exec3<data.txtread-u3lineecho"Line:$line" 使用-a选项将数据分配给数组: 代码语言:bash 复制 read-anumbers<<<"1 2 3 4 5"echo"The first number is:${nu...
read命令除了读取键盘输入,可以用来读取文件。 #!/bin/bash filename='/etc/hosts' while read myline do echo "$myline" done < $filename 上面的例子通过read命令,读取一个文件的内容。done命令后面的定向符<,将文件内容导向read命令,每次读取一行,存入变量myline,直到文件读取完毕。 参数 read命令的参数如下。
bash内置命令mapfile:读取文件内容到数组 bash提供了两个内置命令:readarray和mapfile,它们是同义词。它们的作用是从标准输入读取一行行的数据,然后每一行都赋值给一个数组的各元素。显然,在shell编程中更常用的是从文件、从管道读取,不过也可以从文件描述符中读取数据。
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 复制 #!/usr/bin/env bash echo "What is your name?" read name echo "Your name is ${name}!" 这将等待您(用户)的输入,然后将name变量的值设置为您输入的字符串。
该readarray命令(也拼写为mapfile)是在bash 4.0中引入的。readarray a < /path/to/filename 00 0 子衿沉夜 将文件的每一行读入bash数组的最简单方法是:IFS=$'\n' read -d '' -r -a lines < /etc/passwd现在只需索引数组lines即可检索每一行,例如printf "line 1: %s\n" "${lines[0]}"printf "...
When Bash is started non-interactively, to run a shell script, the Bash looks for the variable BASH_ENV in the environment, unfolds its value if it appears there, and uses the value as the name of a file to read and execute.There are several options for defining the BASH_ENV ...
#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 ...
README MIT license Bash Language Server Bash language server that brings an IDE-like experience for bash scripts to most editors. This is based on theTree Sitter parserand supportsexplainshell,shellcheckandshfmt. Documentation around configuration variables can be found in theconfig.tsfile. ...