command-line-arguments

问题 I have seen many apps that take instrument classes and take -javaagent as a param when loading also put a -noverify to the command line. The Java doc says that -noverify turns off class verification. However why would anyone want to turn off verification even if they are instrumenting classes? 回答1: Start-up time, I'd say. Verification that classes are correct takes some time when the class is loaded. Since classes might be loaded in a lazy fashion (not on app start, but when being used for

问题 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

问题 I am just starting with python so I am struggling with a quite simple example. Basically I want pass the name of an executable plus its input via the command line arguments, e.g.: python myprogram refprogram.exe refinput.txt That means when executing myprogram , it executes refprogram.exe and passes to it as argument refinput . I tried to do it the following way: import sys, string, os print sys.argv res = os.system(sys.argv(1)) sys.argv(2) print res The error message that I get is: res = os

问题 My script should start a demo mode, when the no parameters are given. I tried this: args = parser.parse_args() if len(args) == 0: run_demo() else: # evaluate args Which gives a *** TypeError: object of type 'Namespace' has no len() as args is no list. How would I achieve what I want? 回答1: If your goal is to detect when no argument has been given to the command, then doing this via argparse is the wrong approach (as Ben has nicely pointed out). Think simple! :-) I believe that argparse does

问题 I have a shell script consisting of so many perl scripts, one of the perl script have to be run with differnt input each time and the value has to be stored in a single file at the end as shown #!/bin/sh ..... .... perl test.pl apple perl test.pl mango perl test.pl banana ... ... .... I type these names in command lines by looking at the file generated with these names. **names.txt** apple mango banana OR **names.txt** apple mango banana Is their a way in perl or shell which takes each name

问题 In Bash echo * is almost equivalent to ls . You can do things like echo */*-out/*.html > all-my-html-files-on-one-line Since * is a command line argument then there should be a limit on the length. What is that limit? Is the limit different between echo the Bash command and /bin/echo the program? 回答1: The shell does not limit this You can see the limit for your system with (run on my 64bit linux:) $ getconf ARG_MAX 2097152 See this very informational page http://www.in-ulm.de/~mascheck

问题 Is there a %* (batch files) or $* (bash script) argument list equivalent for VBScript ? I want to retrieve the exact command line invocation. Contrived example: cscript //nologo script.vbs /arg1:a -s "a b" 1 c /arg2:"x y" "d e" -l '3 4' should return: /arg1:a -s "a b" 1 c /arg2:"x y" "d e" -l '3 4' (including the quotes). I have looked at WScript.Arguments but it doesn't return the verbatim command line. 回答1: There is no equivalent to %* or $* in VBScript. The WScript.Arguments collection

问题 I have two computers with Windows, and I just found that on one of them, if I ran python code directly, like: test_args.py input1 input2 Python will not recognized the input I gave, but this works: python test_args.py input1 input2 I tried the code: import sys print 'Number of arguments:', len(sys.argv), 'arguments.' print 'Argument List:', str(sys.argv) And the first way(test_args.py) returns: Number of arguments: 1 arguments. Argument List: ['D:\\Test\\args\\test_args.py'] While the sceond

问题 I'm making a Python program that will parse the fields in some input lines. I'd like to let the user enter the field separator as an option from the command line. I'm using optparse to do this. I'm running into the problem that entering something like \t will separate literally on \t , rather than on a tab, which is what I want. I'm pretty sure this is a Python thing and not the shell, since I've tried every combo of quotes, backslashes, and t 's that I can think of. If I could get optparse

问题 I tried building a set of arguments in a variable and passing that to a script but the behavior different from what I expected. test.sh #!/bin/bash for var in "$@"; do echo "$var" done input usr@host$ ARGS="-a \"arg one\" -b \"arg two\"" usr@host$ ./test.sh $ARGS output -a "arg one" -b "arg two" expected -a arg one -b arg two Note if you pass the quoted arguments directly to the script it works. I also can work around this with eval but I wanted to understand why the first approach failed.