我是谁 whoami

我知道你是谁，但我不知道我是谁，此时whoami可以帮助你，哈哈。

whoami将打印当前用户的名字。与id -un类似。

官方定义为：

whoami - print effective userid

用法为：

$ whoami [option] ..

这命令，基本没有参数。

我暂时。。也没有想到为什么会有这个命令。

唯一的可能使你找管理员来配置个啥，然后他需要知道你是谁，不，我是谁。

我看了一下源码，果然简洁：

#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>#include "system.h"
#include "die.h"
#include "error.h"
#include "long-options.h"
#include "quote.h"/* The official name of this program (e.g., no 'g' prefix).  */
#define PROGRAM_NAME "whoami"#define AUTHORS proper_name ("Richard Mlynarik")void
usage (int status)
{if (status != EXIT_SUCCESS)emit_try_help ();else{printf (_("Usage: %s [OPTION]...\n"), program_name);fputs (_("\
Print the user name associated with the current effective user ID.\n\
Same as id -un.\n\
\n\
"), stdout);fputs (HELP_OPTION_DESCRIPTION, stdout);fputs (VERSION_OPTION_DESCRIPTION, stdout);emit_ancillary_info (PROGRAM_NAME);}exit (status);
}int
main (int argc, char **argv)
{struct passwd *pw;uid_t uid;uid_t NO_UID = -1;initialize_main (&argc, &argv);set_program_name (argv[0]);setlocale (LC_ALL, "");bindtextdomain (PACKAGE, LOCALEDIR);textdomain (PACKAGE);atexit (close_stdout);parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,Version, true, usage, AUTHORS,(char const *) NULL);if (optind != argc){error (0, 0, _("extra operand %s"), quote (argv[optind]));usage (EXIT_FAILURE);}errno = 0;uid = geteuid ();pw = (uid == NO_UID && errno ? NULL : getpwuid (uid));if (!pw)die (EXIT_FAILURE, errno, _("cannot find name for user ID %lu"),(unsigned long int) uid);puts (pw->pw_name);return EXIT_SUCCESS;
}

其中使用的即为uid = geteuid ();。

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