C programming/Command line options - Revision history

Heth at 04:50, 28 May 2020

2020-05-28T04:50:35Z

Heth at 07:18, 23 May 2018

2018-05-23T07:18:24Z

Heth: New page: Example of how to use Command line options. #include #include #include #include void usage( char *name) { printf("Usage: \...

2010-12-07T06:54:44Z

New page: Example of how to use Command line options. <source lang=c> #include <errno.h> #include <stdio.h> #include <string.h> #include <stdlib.h> void usage( char *name) { printf("Usage: \...

New page

Example of how to use Command line options.
<source lang=c>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void usage( char *name) {
printf("Usage: \n");
printf("%s [-l loginname] [-s safetylevel] [-b blocksize]\n",name);
exit(1);
}

int main( int argc, char *argv[] ) {
int c;
extern char *optarg;
while(( c = getopt(argc,argv, "l:s:b:" )) != EOF ) { // Loop the argu ments
switch(c) {
case 'l': printf("l option %s\n",optarg);
break;
case 's': printf("s option %s\n",optarg);
break;
case 'b': printf("b option %s\n",optarg);
break;
default: usage( argv[0]);
}
}
return(0);
}
</source>
[[Category:C]]

@@ Line 5: / Line 5: @@
 #include <string.h>
 #include <stdlib.h>
 void usage( char *name) {
          printf("Usage: \n");

@@ Line 14: / Line 14: @@
          int c;
          extern char *optarg;
-         while(( c = getopt(argc,argv, "l:s:b:" )) != EOF ) {    // Loop the argu                                  ments
+         while(( c = getopt(argc,argv, "l:s:b:" )) != EOF ) {    // Loop the arguments
                  switch(c) {
                  case 'l': printf("l option %s\n",optarg);