FAQ Database Discussion Community

## Why are command line arguments passed as a String array in Java?

java,command-line-arguments,main
In Java, the command line arguments are passed into my program as a String array, like this: public static void main(String[] args ) { } Why does this use an array, and not a single String ? I think it would be more flexible / adaptable if the command line...

## Adjust exception message basing on missing information

python,python-2.7,command-line-arguments,python-2.x,command-line-parsing
Having such code: if __name__ == "__main__": parser.add_argument("--u_shape_dict", default="", action='store', help="required for ...") parser.add_argument("--v_shape_dict", default="", action='store', help="required for ...") u_shape_dict = args['u_shape_dict'] if not u_shape_dict: raise Exception('u_shape_dict is missing. Please provide it') v_shape_dict = args['v_shape_dict'] if not v_shape_dict: raise Exception('v_shape_dict is missing. Please provide it') I want to combine this...

## Run python script with some of the argument that are optional

python,command-line-arguments,argparse,sys
I have gone through the sys documentation, however there is something that is still unclear to me. I have looked for some similar question on stackoverflow, but I haven't find anything useful (clearly any reference is appreciated!). I want to create a script - say foo.py - in which I...

## Create index.php file in directory [closed]

c#,file,directory,command-line-arguments
I want to write a program to be added to the right-click menu and when I run the program from the right-click menu to create an index.php file in current directory! Exmaple: I go to C:\wamp\www Then I right-click somewhere and want to choose create index.php This should create a...

## How to read values from command line in bash script as given?

bash,shell,command-line-arguments

## Python handling options and args

python,arguments,command-line-arguments,options,getopt
I have written a python code and I want to handle switches and arguments. So I want to tell script: If you see -u then there is no -d <name> in arguments print "sth": if sys.argv=='-u' and sys.argv!='-d': print "You must use the -d switch!" sys.exit() Seems this is wrong...

## How to make a short and long version of a required argument using Python Argparse?

python,command-line-arguments,argparse
I want to specify a required argument called inputdir but I also would like to have a shorthand version of it called i. I don't see a concise solution to do this without making both optional arguments and then doing my own check. Is there a preferred practice for this...

## Passing command line argument from the terminal with apostrophe or quote

bash,command-line-arguments
I have seen questions about passing arguments with quotes to a shell script (e.g., this question). My situation is slightly different: I am passing an argument to my java program from the bash terminal. The number of possible arguments is finite (20, to be precise), and one of them is...

## passing arguments to a cURL shell script file

python,shell,curl,command-line-arguments
I do not have much experience with shell or python scripts so I am looking for some help on how I can accomplish this. Goal: Pass arguments to a shell or python script file that will be used to perform either a cURL Post request or a python post request....

## Running executable files using Haskell

Say there's a C++ code that I've compiled into an executable using: g++ test.cpp -o testcpp I can run this using Terminal (I'm using OS X), and provide an input file for processing inside the C++ program, like: ./testcpp < input.txt I was wondering if doing this is possible, from...

## Passing command line arguments to process when debugging with GDB/Eclipse

eclipse,debugging,process,gdb,command-line-arguments
I'm trying to debug process with GDB from Eclipse (CDT). I can start debugging, step on code and so on. So, basic setup seems to work. However, I don't understand how to pass command line arguments to process. Executable is not built with Eclipse, I use separate make files. Steps...

## How to Use Command Line Arguments to Dictate Flow of Program?

java,methods,command-line-arguments
I have scoured all of Google it seems and I cannot find anything regarding how to use command line arguments to tell the Java program which subsequent method to perform. I am trying to create a Java program with several different aspects of a student grading application. The main program...

## segmentation fault and argv, argc

c,segmentation-fault,command-line-arguments
I made a code that prints out the input: int main(int argc, char *argv[]) { printf("%c", *argv[1]); return 0; } When I put something like ab, abcdef, ac, *cf, it works well, but when I put ** or $$it returns 2, and when I put a, k, and so... ## Dealing with backslash as a command line argument in Python python,string,command-line-arguments,backslash I know about escaping backslashes in programming. However I'm passing in a command line argument into a Python program to parse. Whitespace is irrelevant, however via the command line, whitespace does matter. So I am trying to concatenate all argv[] arguments except the first element into a string to then... ## CMake: Adding command line arugments to project cmake,command-line-arguments My question is somewhat similar to this SO but not the same. I created a HelloWorld program with the following: add_executable( HelloWorld {SRC} ) When I generate a project file (for example a Visual Studio .sln file, or a XCode .xcodeproj file). I want to hit the run button and... ## Passing array of arguments to Quartz Scheduler java,command-line-arguments,quartz-scheduler I am trying to add a Quartz Scheduler to an existing Java class. The class uses String[] args as input from the main function. public static void main(String[] args) { //validate(args); summarizeData(args); } But then the Java class implements Job, and it has to use the execute method which only... ## How to correctly quote a command with parameters in a Windows batch file batch-file,command-line-arguments,batch-processing,command-prompt I am attempting to open multiple PDF files in multiple tabs in multiple windows using PDF X-Change Viewer, which has command line options. All PDF files listed in the same line open within the same window. To allow the script to proceed without waiting for the windows created on each... ## Command line arguments and read file/print text in C c,process,command-line-arguments I am trying to work with command line arguments and parsing a text file in C. Basically I want to be able to put in two numbers, like, 1 and 4 and have it read a column of a text file then print it to stdout. I want to be... ## Bash Script: options - case: range of multiple numbers linux,bash,case,command-line-arguments,optional-arguments I'm working on a script in Linux Bash, with different kinds of options to use. Basically, the program is going to ping to the given ip-address. Now, I want to enable the user to write a range of ip-adresses in the terminal, which the program then will ping. Fe: bash... ## Python Command Line Arguments: Calling a function python,command-line,command-line-arguments,argparse,optparse So I'm stuck on a project I'm working on that involves the command line in python. So basically, here's what I'm trying to accomplish: I have a set of functions in a class, say, def do_option1(self, param1, param2) : #some python code here def do_option2(self, param1): #some python code here... ## How can I call a function in a vbscript with command line arguments? vbscript,cmd,command-line-arguments I have a script that executes remotely to see if a program is running. It works fine but I need it to check for several programs on several servers and I don't want to re-write it. I'm trying to see if I can call the function within the vbscript via... ## Command line option for PuTTY (Windows) to set action of mouse buttons to xterm? windows,command-line-arguments,putty As per the title, I'm looking for a command line option which will have the effect of clicking xterm under "Window > Selection > Control use of mouse" in the PuTTY configuration window. I can't see anything in the standard command line options in the PuTTY docs and I'm trying... ## How to pass Ctrl+Enter command to Process when using C# StandardInput redirection c#,process,cmd,command-line-arguments,pos-tagger Im trying to make C# application that uses hunpos tagger. Runing hunpos-tag.exe requires three input arguments: model, inputFile, outputFile In cmd it would look something like this: hunpos-tag.exe model <inputFile >outputFile Although, hunpos-tag.exe can be run with just the model, at that point it'll wait for text input (from cmd)... ## How to interate through command line arguments saved in a variable? bash,iteration,command-line-arguments At some point in my script I need to save value of all command line arguments in a variable (after some shifting), it looks like this: foo="@" Now I need to interate through the arguments from foo variable, but it seems to be quite hard to do it properly if... ## Trying to read string “$$” from command line arguments

c++,string,char,command-line-arguments
I'm trying to get a string from the command line arguments, one of the arguments I'm trying to use is "$$". The argument resides in argv[2]. My program reads "" fine (argv[2] = ""), but when "$$" is used, argv[2] = "29628".... What's going on here? ...

## Python Args not working correctly

python,command-line-arguments
I have this program that is supposed to allow the user to input a start/end arg as well as a file arg and then the program will open a txt file and read line line s starting and ending at the args. but if i type in 2 as the...

## Create parser with subcommands in argparse, customize positional argument(s)

python,command-line-arguments,argparse
I'm very new to this module so please bear with me. I have the following code: reader.py import argparse parent_parser = argparse.ArgumentParser(description="Read text files.") parent_parser.add_argument('filename', help='TXT file', type=file, nargs='+') parent_parser.add_argument('--verbose', '-v', action='store_true', help="Verbosity on") child_parser = parent_parser.add_subparsers(title="subcommand", help="Subcommand help") new_file_command = child_parser.add_parser('new', help="New text file") edit_file_command =...

## sys.argv is different depending on the method of invocation of script

python-2.7,command-line-arguments
I have a simple Python script that all it does is: import sys print sys.argv When I open cmd and type MyScript.py arg1 I get: ['C:\\MyScript.py'] But when type: python MyScript.py arg1 I get: ['C:\\MyScript.py', 'arg1'] I've looked around here but did not find my answer. I've uninstalled and re-installed...

## Command Line Arguments for two .txt files [duplicate]

c#,command-line-arguments
This question already has an answer here: What is “string[] args” in Main class for? 8 answers I have the following program which simply reads two matrices from .txt files into 2D arrays. And I run it from Developer Command Prompt for VS2012 like first picture using System; using...

## Iterative command line arguments in Python

python,command-line-arguments
I am working on Python 2.7.9 and using argparse module for command line arguments. I want to extend my code such that it should be able to take the command line arguments depending on the arguments already given by the user in the same command line. Lets say, the arguments...

## Xcode won't pass arguments to C++ executable

c++,xcode,debugging,command-line-arguments
I'm attempting to debug a C++ project using Xcode. My program looks for input through stdin like so: string line; getline(cin, line); I have an input file called input.txt that I normally pass into the executable like so: ./verti < input.txt In order to accomplish the same thing while debugging...

## How to embed commandline arguments in a execution command?

python,c++,command-line-arguments
I need to pass the commandline arguments of my C++ code as the commandline arguments of my python script. My code looks like: int main(int argc,char * argv[]) { FILE *in; char buff[512]; cout<<argv[1]; string str = "python comparescript.py "+argv[1]+" "+argv[2]+" "+argv[3]; if(!(in = popen(str, "r"))){ cout<<"Image Comparison made successful";...

## Manage multiple following positional argument with argparse

python,command-line-arguments,argparse,args
I'm using this lib for parsing arguments in python : https://docs.python.org/2/library/argparse.html So far I have this: prog arg1 [-s arg2 [arg2 ...]] [-m arg3 [arg3 ...]] And I want this: prog arg1 -s arg2 [arg2 ...] -m arg3 [arg3 ...] Here is my python code: parser = argparse.ArgumentParser() parser.add_argument('path', type=str,...

## Why does my program not check the number of arguments correctly?

c,command-line-arguments,binary-search-tree,stderr
Okay so I am writing code for a binary search tree that must read in strings from an input file: "input.txt" and I am trying to feed my program command line arguments. My program is supposed to take two command line args, the name of the program then the name...

## Passing multiple arguments as comman line args

arrays,vb.net,command-line-arguments
I am calling one .NET app from another using Process.Start and passing in a bunch of strings as command line arguments: startInfo.Arguments = String.Join(""" """, MyArray) Dim p As Process = Process.Start(startInfo) My intent is to pass in something like: "first value" "second value" "third value" and retrieve from within...

## Testing for pipe or console standard input with ARGF

ruby,input,command-line-arguments
I have written a script that I would like to take input either from a pipe or by providing a filename as an argument. ARGF makes it easy to deal with this flexibly, except in the incorrect usage cases where neither is provided, in which case STDIN is opened and...

## Command line arguments is causing Exception in “main” thread

java,arrays,command-line-arguments,bubble-sort
import java.util.*; public class bubblesort { public int input; public int c; public int d; public int swap; public int[] arr= new int[input]; Random rand = new Random(); Scanner in = new Scanner(System.in); public static void main(String[] args) { bubblesort b = new bubblesort(); Scanner in = new Scanner(System.in); System.out.println("Ascending(1),Descending(2),Random(3)");...

## Calling a Powershell script with the “-command” parameter instead of “-file”

powershell,command-line,command-line-arguments
What is the difference between calling a powershell script like this: powershell.exe -file "myfile.ps1" and like this (which also works): powershell.exe -command "myfile.ps1" thanks, robert...

## Change argparse usage message argument order

python,python-3.x,command-line-arguments,argparse
I'm using argparse in python3. In my script, I have some subparsers, a positional argument and some optional arguments. I have an optional argument to pass in any number of file paths, and it's using nargs='*'. The usage message for my script displays like this: usage: myprog.py subparser1 [-h] [--dir...

## How can I easily create a python argparse argument with an inverse?

python-3.x,command-line-arguments,argparse
Using argparse with Python 3, I'd like to create a complementary pair of arguments: --log-file=~/some-default-log-filename.txt --no-log-file As the example implies, by default the log file arguments would have a default value (a filename). You could change that by specifying a different string value to --log-file, or remove the log file...

## Give command line argument (c++)

c++,command-line-arguments
This is a Robot Car program, which has gangsters and cops who catch them. How can I give the number of cops with command line argument? Here is the code (myshmclient.cpp): #include <myshmclient.hpp> char data[524288]; std::vector<justine::sampleclient::MyShmClient::Gangster>justine::sampleclient::MyShmClient::gangsters ( boost::asio::ip::tcp::socket & socket, int id, osmium::unsigned_object_id_type cop ) { boost::system::error_code err; size_t length...

## Accessing option data

python,command-line-arguments,options
I am trying to add an option to a Python program like so: optionParse= argparse.ArgumentParser(description='Change Number of Locations') optionParse.add_argument('-n') The -n option will allow the user to specify a number that will be used in the program. They will input it like this: myProgram.py -n 12 How would I access...

## How to read a text file in to a scanner using command line in Java

java,command-line,command-line-arguments
I have a small snippet of code that will ask user to type input such as 5 12 59 58 28 58 The first number will indicate the size of the array i need to create and the rest of the numbers will be stored in that array. So with...

## bash getopts validate options

linux,bash,scripting,command-line-arguments,getopts
I have following code in bash script: # argument validation and usage help usage() { cat << EOF usage: $0 options File Integrity Monitoring Script: OPTIONS: -b input file for [backup] -r input file for [diff report] -l list backup files EOF } if [$# -eq 0 ] then...

## Segfault for invalid long option

c,segmentation-fault,command-line-arguments,getopt,getopt-long
I have the following code: struct option longopts[] = { {"version", no_argument, 0, 'v'} }; if (argc > 1) { int c; int longindex; while ((c = getopt_long (argc, argv, "v", longopts, &longindex)) != -1) { switch (c) { case 'v': puts (VERSION_INFO); exit (0); case '?': exit (1); }...

## Parsing exclusive groups in Python

python,command-line-arguments,argparse

## how do I know what n(positive integer) is when user types ./a.out -n?

c,command-line-arguments
How do I make an command line argument a variable? That is, for example, how do I know what n(positive integer) is when user types ./a.out -n? I know I can use strcmp(argv[1], "-1") strcmp(argv[1], "-100") but is there a simpler way to implement this?...

## C# Regex command-line argument parsing with single hyphen word wrapping inside argument names

c#,regex,parsing,command-line-arguments
I am developing an opensource/libre command-line parser for .NET which will be restrictive but clear. It seemed to be an easy task at first but for 2 days being trapped with regex problems, not so fun. :( I've been reading hours of tutorials about word matching and grouping but it...

## trouble with str.isnumeric()

python,python-3.x,command-line-arguments,isnumeric
Im trying to test whether a command line argument is a number or not by using the isnumeric string method. It is to my understanding that it returns True if all characters are numeric and false if otherwise however when running it I seem to be getting True regardless of...

## How to make “if” condition change automatically depending on Command Line Argument in Java?

java,if-statement,command-line-arguments
In my code, if condition should change depending on command line argument. For example in the code below: int a = Integer.parseInt(args[0]); for (int i = 0; i < 100000; i++) { if (a == 2) if ((i % 25 == 0) || ((i+1) % 25 == 0) // do...

## how to execute a command using array containing strings with spaces linux

arrays,linux,bash,command-line-arguments
I have been stuck on an issue for a couple of hours now regarding bash shell arrays. I am using an array of strings created from an inputFile using IFS=$'\n' as the separator. Each index of the array may contain multiple words separated by spaces. Each string represents a combination... ## How to split an UTF-8 string by an escape sequence provided as command line argument in Python 3? python,string,split,command-line-arguments,ansi-escape I'm trying to seperate UTF-8 strings by a delimiter provided as command line argument in Python3. The TAB character "\t" should be a valid option. Unfortunately I didn't find any solution to interpret an escape sequence as such. I wrote a little test script called "test.py" 1 # coding: utf8... ## Linux how to pass date command's output as input for a python program as command line argument python,linux,pipe,command-line-arguments I am quite a newbie to Linux. I have a very simple Python script that accepts command line arguments and prints them. Now I just want to pass the date command's output as input to this Python script and print it. The Python script looks like this. import sys print... ## How to run pytest.main(“-v test_script2.py”) when test_script2.py needs some command line arguments in order for the test functions to run? python,command-line-arguments,py.test I have two scripts. One script parses all the arguments and decides the control flow of the script. Another script has all the test functions defined and I wanted to use pytest module to invoke the 'test_script2.py' and run all the tests. But there are some arguments that I need... ## What are some use cases of “$*” in bash?

bash,parameters,arguments,command-line-arguments
From the bash man page: "$*" is equivalent to "$1c$2c...", where c is the first character of the value of the IFS variable. "$@" is equivalent to "$1" "$2" ... Any example where "$@" cannot work in place of "$*"?...

## C++ How to pass command line argument to read txt file

c++,command-line-arguments
What I've been trying to do is... 1) to read txt files by command line argument, 2) to use strings in the txt files as arguments for the main method (or whatever method you need to invoke). For example, there are two txt files, one of which is named character.txt...

## Best way to access image files to improve performance

c#,vb.net,image,performance,command-line-arguments
I am using a graphicmagick.exe (command tool) to convert the file from one format to another format: In that, I used to pass input path and output path for conversion as aruguments. Now I am looping a directory using foreach and passing the input file one by one and converting...

## perl App::Cmd call subcommand from script

perl,command-line-arguments
I am trying to call a command line application implemented using App::Cmd from another script (without a system call). My application is taken from the tutorial for the package, having a a script yourapp: #!/usr/bin/perl use YourApp; an application class YourApp.pm: package YourApp; use App::Cmd::Setup -app; 1; and a command...

## How can I append the values from an input file to the command line options using argparse?

python,command-line-arguments,argparse
Say I have a yaml input file (input.txt) that contains the following: names: [Bob, Jill] ages: [22, 31] county: somewhere my code to parse this: import yaml import argparse parser = argparse.ArgumentParser() parser.add_argument('--name', default=[], dest='names', action='append') parser.add_argument('--age', default=[], dest='ages', action='append') parser.add_argument('--county', dest='county') parser.add_argument( '--config-file', dest='config_file', type=argparse.FileType(mode='r')) args = parser.parse_args() print...

## Use numeric value of input argument in Bash script [duplicate]

linux,bash,command-line-arguments
This question already has an answer here: Brace expansion with variable? 5 answers I would like to use the numeric value of the input argument that I pass to a bash script like this: ./script_pb3.sh out.txt 3 Here I would like to take the second argument that I pass...

## how to pass input and configurations files by using linux command

c++,linux,parameters,command-line-arguments
I have an executable file vs-vectorize for which I want to pass a file to analyze along side its configuration files. I am Very very new to linux so excuse my question. The file to analyze is in xml format: <doc id="E0211315"> <text> Gimme Dat For the Chris Brown song,...

## How to add command line argument to a web application(Spring MVC)

web-applications,wsdl,cxf,command-line-arguments
I'm working on a web project that uses Apache CXF and web services, which i use to hit a request to server and get the response back. The server(Actually the service provider) had given me some username and password. Now, when I run my request as a java application...

## Memory Management Command Line Arguments in C

c,command-line-arguments
I am writing a simple program that takes the command line arguments and stores them into a char **. I am trying to learn more about memory management but cannot get past this simple stumbling block. My program is supposed to copy the command line argumetns into a dynamicly allocated...

## Multiple file input, with stdin // Argparse4j, Java

java,file,command-line-interface,command-line-arguments,stdin
I'm trying to use Argparse4j to build a command line utility. I need to create an option that accepts multiple input files, but also accepts stdin: subparser.addArgument("input") .nargs("*") .setDefault(Arrays.asList("-")) .type(Arguments.fileType().acceptSystemIn().verifyCanRead()); If I don't use Arrays.asList, then sometimes I get just a File object, instead of a List<File>. However, using nargs("*")...

## Setting an environment variable on same line as program execution is different than setting it separately? - shell variables vs. environment variables

bash,shell,environment-variables,command-line-arguments

## Updating Ubuntu 11.04 to 12.04 preferrably through command line

I am attempting to update my Ubuntu Natty Narwhal (11.04) to Precise Pangolin (12.04). When I checked the Update Manager, I was told I couldn't do that. I had to get to 11.10 first, if I want it safely. Sounds like a plan. And so I've ran through the Update...

## How to have a.out file read text file through terminal by typing “a.out < textfilename.txt”

c++,command-line-arguments
I'm new to programming and I couldn't find an answer to my problem. This is the code I have to have my program open and read the text file I want while running it on the terminal: using namespace std; int main(int argc, string *argv[]) { string fileName; getline(cin, fileName);...

## Test if string represents “yyyy-mm-dd”

c++,command-line-arguments
I am working on a program that takes two command line arguments. Both arguments should be dates of the form yyyy-mm-dd. Since other folks will be using this program and it will be requesting from mysql, I want to make sure that the command line arguments are valid. My original...

## Reading lines from .txt into batch file and handing into command line as arguments?

python,batch-file,command-line-interface,command-line-arguments
I need to read each line of a .txt file, line by line, handing in each line as an argument to a process I'm running in the CMD line interface. In the command line it would look like: "process c:/script.js arguments". I originally did this using Python: with open("C:\path\to\document.txt", "r")...

## Parameter checks in bash not testing correctly

linux,bash,command-line,command-line-arguments
I've been scratching my head about this for a while... I'm trying to get my code to react like: If no parameters, go to menu If more OR less than 4 parameters, call error and go to menu If exactly 4 parameters, write to file and exit I can't get...

## Setting a flag using a command-line argument with Argparse4j

java,command-line-arguments,argparse4j
I am using argparse4j to parse command line arguments. I want to add an argument that when present, sets a boolean to true, otherwise it defaults to false. I don't want to include the true or false in the argument, just the identifier, so it would look something like this...