如果用户的输入项少于read命令给出的变量数目,那么额外的变量值为空。如果用户的输入项多于定义的变量,那么多余的输入项会包含到最后一个变量中。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 ...
首先,Shell 是一个程序,提供一个与用户对话的环境。这个环境只有一个命令提示符,让用户从键盘输入命令,所以又称为命令行环境(commandline,简写为 CLI)。Shell 接收到用户输入的命令,将命令送入操作系统执行,并将结果返回给用户。本书中,除非特别指明,Shell 指的就是命令行环境。 其次,Shell 是一个命令解释器,解释...
#! /bin/bash read word if (( $word = "y" || $word = "Y" )) then echo "YES" elif (( $word = "n" || $word = "N" )) then echo "NO" fi 我得到这个错误: Solution.sh: line 5: ((: y = y || y = Y : attempted assignment to non-variable (error token is "= Y ...
我知道我可以通过使用${file##*/}去掉路径来获得我们想要用来创建变量名的文件名(例如,./config/foo变成foo),但如何将结果转换为变量名,然后像原始脚本一样将其设置为文件第一行的内容? 到目前为止,以下是我所拥有的,其中DYNAMIC_VARIABLE_NAME_HERE将是我们可以从${file##*/}中获得的名称: #!/bin/bash #...
variable assignments, etc. */REDIRECT*redirects;/* Redirections to perform. */}SIMPLE_COM; while命令结构: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /* WHILE command. */typedef struct while_com{int flags;/* See description of CMD flags. */COMMAND*test;/* Thing to test. */COMMAND...
array+=("$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<. ...
Create a bash file and then add the below-mentioned code in this file to read the file content. You can store the previous text file into a new variable$filenameand variable$nis used to keep the value of each line. Now, using the while loop we will read each line from a file with...
Here, each line in the file is divided into two segments as we have passed two variables to thereadcommand. The first segment will be assigned to thenamevariable, which extends from the beginning of the line until the first-, and the remaining portion will be assigned to theearningsvariable...
When bash is started in posix mode, as with the --posix com- mand line option, it follows the POSIX standard for startup files. In this mode, interactive shells expand the ENV variable and commands are read and executed from the file whose name is the expanded value. No other startup ...
README MIT PathPicker Facebook PathPicker is a simple command line tool that solves the perpetual problem of selecting files out of bash output. PathPicker will: Parse all incoming lines for entries that look like files Present the piped input in a convenient selector UI ...