Converting a hostname argv into an IP

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

ARGV how to use it?

So i am trying to read in file readFile <GivenFile> modFile looking for a regular file under the directories in the GivenFile and print them out is my over all goal. basically I am looking for anything that looks like a directory in the given file and printing it out. Since I am trying to do...

2. UNIX for Advanced & Expert Users

Hostname -f hostname: Unknown host

deleted

3. UNIX for Advanced & Expert Users

O argv, argv, wherefore art thou argv?

All of my machines (various open source derivatives on x86 and amd64) store argv above the stack (at a higher memory address). I am curious to learn if any systems store argv below the stack (at a lower memory address). I am particularly interested in proprietary Unices, such as Solaris, HP-UX,...

4. Emergency UNIX and Linux Support

HP UX - ILO Console hostname different than Machine Hostname...

Hi All, So we added a new HP-UX 11.31 machine. Copied OS via Ignite-UX (DVD)over from this machine called machine_a. It was supposed to be named machine_c. And it is when you log in...however when I'm in the ILO console before logging in, it says: It should say: What gives? And how do...

5. Programming

help with C, argv

when i run my program, i have a parameter, that i want to set the value to another string i am using int main(int argc, char **argv) { char my_str=argv; printf("%s",my_str); return 0; } and i get Segmentation fault ran using ./my_prog /usr/share/dict/words hello1 ...

6. Programming

ARGV help in C

Hi, Can somehelp help how to list file in a dir?

7. Shell Programming and Scripting

if #argv = (this OR that) then...

this is in one of my scripts... if ($#argv == 0) then echo 'blah bla' exit 0 endif I want it to be something like this... if ($#argv == 0 OR $argv >=3) echo 'blah bla' exit 0 endif so when the arguments are none, or greater than three I want this "if then" to take over. how? I...

8. Programming

help for argv argc

Hi C experts, I have the following code for adding command line option for a program int main (argc, argv) int argc; char *argv; { char *mem_type; //memory type char *name; //name of the memory int addr; //address bits int data; ...

9. UNIX for Dummies Questions & Answers

Solaris - unknown hostname - how can I change hostname?

Hello, I am new to Solaris. I am using stand alone Solaris 10.0 for test/study purpose and connecting to internet via an ADSL modem which has DHCP server. My Solaris is working on VMWare within winXP. My WinXP and Solaris connects to internet by the same ADSL modem via its DHCP at the same...

10. Programming

argv

I have a program which I wish to modify. It used to be run from the command line, but now I wish to change this so it can be used as a function. The program has complex argument processing so I want to pass my paramters to as if it were being called by the OS as a program. I have tried to...

LEARN ABOUT ULTRIX

getopt

getopt(3)						     Library Functions Manual							 getopt(3)

Name
       getopt - get option letter from argument vector

Syntax
       #include <stdio.h>
       int getopt (argc, argv, optstring)
       int argc;
       char **argv;
       char *optstring;

       extern char *optarg;
       extern int optind, opterr;

Description
       The  subroutine	returns the next option letter in argv that matches a letter in optstring.  The optstring is a string of recognized option
       letters; if a letter is followed by a colon, the option is expected to have an argument that may or may not be separated from it  by  white
       space.  The optarg is set to point to the start of the option argument on return from

       The  function places in optind the argv index of the next argument to be processed.  The external variable optind is automatically initial-
       ized to 1 before the first call to

       When all options have been processed (that is, up to the first non-option argument), returns EOF.  The special option --  may  be  used	to
       delimit the end of the options; EOF will be returned, and -- will be skipped.

Diagnostics
       The function prints an error message on stderr and returns a question mark (?)  when it encounters an option letter that is not included in
       optstring.  Setting opterr to 0 disables this error message.

Examples
       The following code fragment shows how one might process the arguments for a command that can take the mutually exclusive options a  and	b,
       and the options f and o, both of which require arguments:
       #include <stdio.h>
       main (argc, argv)
       int argc;
       char **argv;
       {
	      int c;
	      extern int optind, opterr;
	      extern char *optarg;
	      .
	      .
	      .
	      .
	      while ((c = getopt (argc, argv, "abf:o:")) != EOF)
		       switch (c) {
		       case 'a':
			       if (bflg)
				       errflg++;
			       else
				       aflg++;
			       break;
		       case 'b':
			       if (aflg)
				       errflg++;
			       else
				       bproc( );
			       break;
		       case 'f':
			       ifile = optarg;
			       break;
		       case 'o':
			       ofile = optarg;
			       bufsiza = 512;
			       break;
		       case '?':
			       errflg++;
		       }
	       if (errflg) {
		       fprintf (stderr, "usage: . . . ");
		       exit (2);
	       }
	       for ( ; optind < argc; optind++) {
		      if (access (argv[optind], 4)) {
	       .
	       .
	       .
       }

See Also
       getopt(1)

																	 getopt(3)

Programming