Florian Fischer
31 lines
1.0 KiB
C
31 lines
1.0 KiB
C
/// @file id.c
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/// @brief
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/// @copyright (c) 2024 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <sys/unistd.h>
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char **argv)
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{
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if (argc == 1) {
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printf("uid=%d gid=%d\n", geteuid(), getegid());
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} else if (strncmp(argv[1], "--help", 6) == 0) {
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printf("Usage: %s [OPTION]\n", argv[0]);
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printf("Print user and group information\n\n");
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printf(" -g, --group print only the effective group ID");
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printf(" -u, --user print only the effective user ID");
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printf(" --help display this help and exit");
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} else if (strncmp(argv[1], "-u", 2) == 0 || strncmp(argv[1], "--user", 6) == 0) {
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printf("%d\n", geteuid());
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} else if (strncmp(argv[1], "-g", 2) == 0 || strncmp(argv[1], "--group", 7) == 0) {
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printf("%d\n", getegid());
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} else {
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printf("%s: invalid option '%s'\n", argv[0], argv[1]);
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printf("Try '%s --help' for more information\n", argv[0]);
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}
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return 0;
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}
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