' # Note that we use `"$@"'to let each command-line parameter expand to a # separate word. The quotes around `$@'are essential! # We need TEMPasthe `evalset--'would nuke the return value of getopt. #-o表示短选项,两个冒号表示该选项有一个可选参数,可选参数必须紧贴选项 #如-carg ...
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Chapter 7. Input/Output and Command-Line Processing The past few chapters have gone into detail about various shell programming techniques, mostly focused on the flow of data and control through shell … - Selection from Learning the bash Shell, Second
0<input.txt中,0是标准输出的文件描述符,它表示把标准输入重定向到文件input.txt中(注意这里是<号,而标准输出重定向是>号)。对于标准输入,0可以省略掉,所以直接写为sum <input.txt即可。 我们再举一个例子,cat是一个非常实用的程序,它可以将文件打印到屏幕上(前面多次演示过),还可以把多个文件拼接起来(concate...
#We are now going back to standard output, by using echo and printing your name to the command line. echo "With standard input you have told me your name is: $name" 这个示例通过标准输出给出提示,提醒用户输入信息,然后从标准输入(键盘)获取信息,使用read将其存储在name变量中,并通过标准输出显示...
Preventing your script from running unless the command line is valid. Providing you with a place to input your code for each of the functions your tool performs, and merging it back to the final script. Providing you with additional (optional) framework-style, standard library functions: ...
本文也即《Learning the bash Shell》3rd Edition的第七章Input/Output and Command-Line Processing之读 bash linux shell newline processing 原创 flowingflying 2023-04-10 07:54:56 67阅读 Linux Bash Shell学习(十四):命令行选项 本文也即《Learning the bash Shell》3rd Edition的第六章Command-Line Op...
urlencode.sh / urldecode.sh - URL encode/decode quickly on the command line, in pipes etc. urlextract.sh - extracts the URLs from a given string arg, file or standard input url_extract_redirects.sh - extracts the URLs from a given string arg, file or standard input, queries each one ...
1 Bash Scripting: Output multiple lines to one line 0 execute each line of output in bash 2 For each line of input, emit that line alongside output from passing it to a command 3 Bash script, execute command prefixing every line with a given string 1 bash prepend text to...
CAT(1) User Commands CAT(1) NAME cat - concatenate files and print on the standard output SYNOPSIS cat [OPTION]... [FILE]... DESCRIPTION Concatenate FILE(s) to standard output. With no FILE, or when FILE is -, read standard input. -A, --show-all equivalent to -vET -b, --number...