Created
June 10, 2013 03:33
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/* | |
* Author: NagaChaitanya Vellanki | |
* | |
* | |
* ./read_group_file sys 0 | |
* | |
* sample output | |
* --------------------- | |
* Group name: sys | |
* Encrypted password: x | |
* Group id: 3 | |
* | |
* Group name: root | |
* Encrypted password: x | |
* Group id: 0 | |
* | |
*/ | |
#include <string.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <stdarg.h> | |
#include <grp.h> | |
void err_exit(const char *format, ...) { | |
va_list args; | |
va_start(args, format); | |
vfprintf(stderr, format, args); | |
va_end(args); | |
exit(EXIT_FAILURE); | |
} | |
void print_group_info(struct group *grp) { | |
if(grp != NULL) { | |
printf("Group name: %s\n", grp->gr_name); | |
printf("Encrypted password: %s\n", grp->gr_passwd); | |
printf("Group id: %d\n", grp->gr_gid); | |
for(; *(grp->gr_mem) != NULL; (grp->gr_mem)++) { | |
printf("%s\n", *(grp->gr_mem)); | |
} | |
} | |
} | |
int main(int argc, char *argv[]) { | |
gid_t gid; | |
if(argc < 3 || strcmp(argv[1], "--help") == 0) { | |
err_exit("Usage: %s group gid\n", argv[0]); | |
} | |
/* get info using group */ | |
print_group_info(getgrnam(argv[1])); | |
printf("\n"); | |
/* get info using group id */ | |
gid = atoi(argv[2]); | |
print_group_info(getgrgid(gid)); | |
exit(EXIT_SUCCESS); | |
} |
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