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What is the command line?

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Hi, this should probably be in the beginners forum but here goes anyway. I am reading various documents about programming apps that read a file at start up and perform certain functions. The book I''m reading keeps refering to the command line. Eg, If the user runs program x with no command line arguments the program will exit. Is it some sort of initialization process or something? If someone could elaborate on command lines that would be a great help. Sorry if this sounds like a stupid question, Thanks

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the command line is the things you write after a program name
eg: tar -x -v -f archive.tar
that command runs the program "tar" with 4 command line arguments.

In your program, the command line arguments are defined as follow

#include <stdio.h>
int main(int argc, char *argv[])
// argc is the number of argument (including the executable)
// so with the example above it would be 5
// argv[0] is "tar"
// argv[1] is "-x"
// up to argv[argc - 1]
// if you want to list all command line arguments, simply do
int i;
for(i=0; i<argc; i++)
printf("argument #%d: %s\n", i, argv);

return 0;

[edited by - lemurion on October 8, 2003 12:06:02 PM]

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