There are several methods to read user input into a variable in Bash, here are some commonly used methods to do it: using the read command using a prompt 1: Using the read Command The read command is used to receive user input from the command line and store it in a variable, the sy...
read: read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...] Read a line from the standard input and split it into fields. Reads a single line from the standard input, or from file descriptor FD if the -u...
如果read命令之后没有定义变量名,那么环境变量REPLY会包含所有的输入。 #!/bin/bash # read-single: read multiple values into default variable echo -n "Enter one or more values > " read echo "REPLY = '$REPLY'" 1. 2. 3. 4. 5. 上面脚本的运行结果如下。 $ read-single Enter one or more ...
开始学Bash(上) 11.read 命令 用法 有时,脚本需要在执行过程中,由用户提供一部分数据,这时可以使用read命令。它将用户的输入存入一个变量,方便后面的代码使用。用户按下回车键,就表示输入结束。 read命令的格式如下。 read [-options] [variable...] 上面语
内建命令 read 可以接受 -a 选项,从标准输入读入一列词来为数组赋值。内 建命令 set 和 declare 使用一种可以重用为输入的格式来显示数组元素。 扩展(EXPANSION) 命令行的扩展是在拆分成词之后进行的。有七种类型的扩展: brace expansion( 花括号扩展), tilde expansion( 波浪线扩展), parameter and variable ...
array+=("$line")the line variable stores the value of each line in the file and using this argument, it gets stored in an array. done < "$file"instructs the loop to read the filename from the$fileusing the input redirection<. ...
The different uses of the “read” command with the prompt message are shown in this part of the tutorial. Example 1: Take the String Input Using Prompt Create a Bash file with the following script that takes the first input without the prompt message into the default variable which is $RE...
used to remove any special meaning for the next character read and for line continuation. Options, if supplied, have the fol- lowing meanings: -a aname The words are assigned to sequential indices of the array variable aname, starting at 0. aname is unset before any ...
It increases both the convenience and the safety of such operating systems and is widely considered to be the single most important environmental variable. 注意: 另外,我们讨论的前提是当你键入一个命令时并没有指定该命令的路径, 举例来说就是我们键入的命令是以commandname的形式而不是/path/commandname或...
Input is read from the current input stream (bash_input). yyparse leaves the parsed command in the global variable GLOBAL_COMMAND. This is where PROMPT_COMMAND is executed. */intparse_command(){...r=yyparse();if(need_here_doc)gather_here_documents();return(r);} parse...