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Implement -g and -u for id(1)

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sin 2014-06-11 15:42:33 +01:00
parent d3e332c72d
commit db0ea785f0
2 changed files with 14 additions and 2 deletions
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8
id.1
View File

@ -2,13 +2,19 @@
.SH NAME .SH NAME
\fBid\fR - Print real and effective user and group IDs \fBid\fR - Print real and effective user and group IDs
.SH SYNOPSIS .SH SYNOPSIS
\fBid\fR [\fB-G\fR] \fR[\fIuser\fR|\fIuid\fR] \fBid\fR [\fB-g\fR] [\fB-u\fR] [\fB-G\fR] \fR[\fIuser\fR|\fIuid\fR]
.SH DESCRIPTION .SH DESCRIPTION
\fBid\fR prints user and group information of the calling process to standard output. \fBid\fR prints user and group information of the calling process to standard output.
If a login name or uid is specified, the user and group information of that If a login name or uid is specified, the user and group information of that
user is displayed. user is displayed.
.SH OPTIONS .SH OPTIONS
.TP .TP
\fB-g\fR
Print only the effective group ID.
.TP
\fB-u\fR
Print only the effective user ID.
.TP
\fB-G\fR \fB-G\fR
Display group information as whitespace separated numbers, in no particular order. Display group information as whitespace separated numbers, in no particular order.
.SH SEE ALSO .SH SEE ALSO

8
id.c
View File

@ -18,7 +18,7 @@ static void usernam(const char *nam);
static void static void
usage(void) usage(void)
{ {
eprintf("usage: %s [-G] [user | uid]\n", argv0); eprintf("usage: %s [-g] [-u] [-G] [user | uid]\n", argv0);
} }
static int Gflag = 0; static int Gflag = 0;
@ -27,6 +27,12 @@ int
main(int argc, char *argv[]) main(int argc, char *argv[])
{ {
ARGBEGIN { ARGBEGIN {
case 'g':
printf("%d\n", getegid());
return EXIT_SUCCESS;
case 'u':
printf("%d\n", geteuid());
return EXIT_SUCCESS;
case 'G': case 'G':
Gflag = 1; Gflag = 1;
break; break;