command-line-parsing | 易学教程

Perl: How to use command line special characters (newline, tab) in $LIST_SEPARATOR ($")

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问题 I would like to use the value of a variable (fixed by a command line option for instance) as a list separator, enabling that value to be a special character (newline, tabulation, etc.). Unfortunately the naïve approach does not work due to the fact that the two following print statement behave differentely : my @tab = ("a","b","c"); # block 1 gives expected result: # a # b # c { local $" = "\n"; #" let us please the color syntax engine print "@tab"; } # block 2 gives unwanted result: # a\nb

shortcut to replace all strings in previous bash command

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问题 man bash describes a very useful Event Designator ^string1^string2^ Quick substitution. Repeat the last command, replacing string1 with string2. Equivalent to ''!!:s/string1/string2/'' Is there a way to execute !!:gs/string1/string2/ when typing in @string1@string2@ on the command line to replace all occurrences in the previous command? ( @ or any other designated character/string) 回答1: ^string1^string2^:g& See question Replace all occurrences of a word in the last command. See Modifiers in

Sets of mutually exclusive options in boost program options

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问题 My program ( prog.exe ) supports the following four flags: -P , -p , -b and -s . However: -b and -p must be specified together, constitute a set, and have numeric values e.g. -b 42 -s cannot be specified with the above set, and vice versa -P is mandatory in both cases As such prog.exe can only be run as either prog.exe -P -s or prog.exe -P -b -42 -p 8 Is there a way to specify the above sets of mutually exclusive command line options in boost program options? 回答1: You should start with a few

How do you parse arguments for a java program?

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问题 I'm making a Selenium WebDriver java program. I have 25 application and 4 environments. I need to be able to pass something like -app app1 app2 app3 ... appn -env env1 env2 envn I need to be able to pass either, neither or both arguments. Right now I have it being able to pass one app and one env in that order but I need to be able to do it in either order and with the either neither or both possibility. Here's what I have so far. With this I can either pass no arguments and runs every app

How do you make flags for command line arguments in Java? [closed]

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I have an enum for 25 applications and an enum for some environments. Right now with the code I have I can either pass no arguments and it runs all of the application in all of the environments(which is what I want) or I can pass one app and one environment in that order it will run that. I need to be able to pass a list of apps by doing something like -app app1 app2 app3 ... -env env1 env2... I've never used flags before or tried parsing an array of commands before. Here's part of the code. I think the if is good but the else is where I need help. public static Application chooseAppTest

How to capture arguments passed to a Groovy script?

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I am just starting out with Groovy. I couldn't find any examples anywhere of how to handle arguments to a Groovy script and so I hacked this method myself. There must be a better way of doing this? If so, I am looking for this better way, since I am probably overlooking the obvious. import groovy.lang.Binding; Binding binding = new Binding(); int x = 1 for (a in this.args) { println("arg$x: " + a) binding.setProperty("arg$x", a); x=x+1 } println binding.getProperty("arg1") println binding.getProperty("arg2") println binding.getProperty("arg3") xlson If you want more advanced parsing than just

Unquoted tokens in argument mode involving variable references and subexpressions: why are they sometimes split into multiple arguments?

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Note: A summary of this question has since been posted at the PowerShell GitHub repository , since superseded by this more comprehensive issue . Arguments passed to a command in PowerShell are parsed in argument mode (as opposed to expression mode - see Get-Help about_Parsing ). Conveniently, (double-)quoting arguments that do not contain whitespace or metacharacters is usually optional , even when these arguments involve variable references (e.g. $HOME\sub ) or subexpressions (e.g., version=$($PsVersionTable.PsVersion) . For the most part, such unquoted arguments are treated as if they were

Parsing/passing command line arguments to a bash script - what is the difference between “$@” and “$*”?

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I am using a bash script to call and execute a .jar file from any location without having to constantly enter its explicit path. The .jar requires additional variable parameters to be specified at execution, and as these can be anything, they cannot be hard coded into the script. There are 3 variables in total, the first specifies 1 of 2 actions that the .jar is to make, the second specifies a target file to enact this action on and the third specifies the name of a file that the action is to create. The script I am currently using is: #!/bin/bash java -jar "C:\path\to\file.jar" "$1" "$2" "$3"

Best way to parse command-line parameters? [closed]

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What's the best way to parse command-line parameters in Scala? I personally prefer something lightweight that does not require external jar. Related: How do I parse command line arguments in Java? What parameter parser libraries are there for C++? Best way to parse command line arguments in C# pjotrp For most cases you do not need an external parser. Scala's pattern matching allows consuming args in a functional style. For example: object MmlAlnApp { val usage = """ Usage: mmlaln [--min-size num] [--max-size num] filename """ def main(args: Array[String]) { if (args.length == 0) println(usage)

Passing a List to Python From Command Line

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I would like to make my python script run from the command line when supplies with some arguments. However, one of the arguments should be a list of options specific to one segment of the script. Would string parsing be the only way to do this by actually constructing the list after the "command line list" string is split from commas? If so, how would you go about that? Example: -details=['name', 'title', 'address'] Program: import sys, ast, getopt, types def main(argv): arg_dict={} switches={'li':list,'di':dict,'tu':tuple} singles=''.join([x[0]+':' for x in switches]) long_form=[x+'=' for x