Dive deep into the intricacies of command line arguments in C with the CommandLineMaster-C repository. This comprehensive guide will take you from the basics to advanced usage, ensuring you gain a profound understanding of this essential programming concept
Command line arguments are parameters provided to a program when it is invoked. These arguments allow users to specify different inputs without modifying the program's source code.
For instance, in the command ls -l
, ls
is the program and -l
is the command line argument that instructs the program to display the files in a long format.
In C, command line arguments can be read using the argc
and argv
parameters of the main()
function. Here's a brief explanation:
argc
: Stands for "argument count". It represents the number of arguments passed to the program, including the program's name.argv
: Stands for "argument vector". It is an array of strings representing the individual arguments provided to the program.
Here's a simple example:
#include <stdio.h>
int main(int argc, char *argv[]) {
printf("Number of arguments: %d\n", argc);
for (int i = 0; i < argc; i ) {
printf("Argument %d: %s\n", i, argv[i]);
}
return 0;
}
argz
and envz
are interfaces used for argument and environment vector manipulation in C, especially with GNU extensions.
-
argz: Represents a sequence of strings packed into one allocated block of memory, separated by null bytes (
\0
), and terminated by a double null byte (\0\0
). -
envz: It's similar to
argz
but is used specifically for environment variables.
These interfaces provide a more dynamic way to manipulate command line arguments and environment variables compared to traditional string arrays (argv
and envp
). Functions like argz_add()
, argz_delete()
, envz_add()
, and envz_remove()
allow for easy and dynamic modifications.
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This project is licensed under the MIT License. See the LICENSE file for details.