Não acho que haja um utilitário que faça o que você deseja. Olhando para a fonte da agetty codificar a função do_prompt (...) basicamente abre o / etc / arquivo de assunto e lê isto caráter por caráter e ou exibe o caractere leu ou se é um \ lê o próximo char e então entra uma declaração de comutador para exibir a informação relevante. Não seria muito difícil converter isso em um script ... de qualquer maneira, aqui está o código relevante
void
do_prompt(op, tp)
struct options *op;
struct termios *tp;
{
#ifdef ISSUE
FILE *fd;
int oflag;
int c;
struct utsname uts;
(void) uname(&uts);
#endif
(void) write(1, "\r\n", 2); /* start a new line */
#ifdef ISSUE /* optional: show /etc/issue */
if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) {
oflag = tp->c_oflag; /* save current setting */
tp->c_oflag |= (ONLCR | OPOST); /* map NL in output to CR-NL */
(void) tcsetattr(0, TCSADRAIN, tp);
while ((c = getc(fd)) != EOF)
{
if (c == '\')
{
c = getc(fd);
switch (c)
{
case 's':
(void) printf ("%s", uts.sysname);
break;
case 'n':
(void) printf ("%s", uts.nodename);
break;
case 'r':
(void) printf ("%s", uts.release);
break;
case 'v':
(void) printf ("%s", uts.version);
break;
case 'm':
(void) printf ("%s", uts.machine);
break;
case 'o':
{
char domainname[MAXHOSTNAMELEN+1];
#ifdef HAVE_GETDOMAINNAME
if (getdomainname(domainname, sizeof(domainname)))
#endif
strcpy(domainname, "unknown_domain");
domainname[sizeof(domainname)-1] = 'void
do_prompt(op, tp)
struct options *op;
struct termios *tp;
{
#ifdef ISSUE
FILE *fd;
int oflag;
int c;
struct utsname uts;
(void) uname(&uts);
#endif
(void) write(1, "\r\n", 2); /* start a new line */
#ifdef ISSUE /* optional: show /etc/issue */
if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) {
oflag = tp->c_oflag; /* save current setting */
tp->c_oflag |= (ONLCR | OPOST); /* map NL in output to CR-NL */
(void) tcsetattr(0, TCSADRAIN, tp);
while ((c = getc(fd)) != EOF)
{
if (c == '\')
{
c = getc(fd);
switch (c)
{
case 's':
(void) printf ("%s", uts.sysname);
break;
case 'n':
(void) printf ("%s", uts.nodename);
break;
case 'r':
(void) printf ("%s", uts.release);
break;
case 'v':
(void) printf ("%s", uts.version);
break;
case 'm':
(void) printf ("%s", uts.machine);
break;
case 'o':
{
char domainname[MAXHOSTNAMELEN+1];
#ifdef HAVE_GETDOMAINNAME
if (getdomainname(domainname, sizeof(domainname)))
#endif
strcpy(domainname, "unknown_domain");
domainname[sizeof(domainname)-1] = '%pre%';
printf ("%s", domainname);
}
break;
case 'O':
{
char *dom = "unknown_domain";
char host[MAXHOSTNAMELEN+1];
struct addrinfo hints, *info = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
if (gethostname(host, sizeof(host)) ||
getaddrinfo(host, NULL, &hints, &info) ||
info == NULL)
fputs(dom, stdout);
else {
char *canon;
if (info->ai_canonname &&
(canon = strchr(info->ai_canonname, '.')))
dom = canon + 1;
fputs(dom, stdout);
freeaddrinfo(info);
}
}
break;
case 'd':
case 't':
{
/* TODO: use nl_langinfo() */
char *weekday[] = { "Sun", "Mon", "Tue", "Wed", "Thu",
"Fri", "Sat" };
char *month[] = { "Jan", "Feb", "Mar", "Apr", "May",
"Jun", "Jul", "Aug", "Sep", "Oct",
"Nov", "Dec" };
time_t now;
struct tm *tm;
(void) time (&now);
tm = localtime(&now);
if (c == 'd')
(void) printf ("%s %s %d %d",
weekday[tm->tm_wday], month[tm->tm_mon],
tm->tm_mday,
tm->tm_year < 70 ? tm->tm_year + 2000 :
tm->tm_year + 1900);
else
(void) printf ("%02d:%02d:%02d",
tm->tm_hour, tm->tm_min, tm->tm_sec);
break;
}
case 'l':
(void) printf ("%s", op->tty);
break;
case 'b':
{
int i;
for (i = 0; speedtab[i].speed; i++) {
if (speedtab[i].code == cfgetispeed(tp)) {
printf("%ld", speedtab[i].speed);
break;
}
}
break;
}
case 'u':
case 'U':
{
int users = 0;
struct utmp *ut;
setutent();
while ((ut = getutent()))
if (ut->ut_type == USER_PROCESS)
users++;
endutent();
printf ("%d ", users);
if (c == 'U')
printf ((users == 1) ? _("user") : _("users"));
break;
}
default:
(void) putchar(c);
}
}
else
(void) putchar(c);
}
fflush(stdout);
tp->c_oflag = oflag; /* restore settings */
(void) tcsetattr(0, TCSADRAIN, tp); /* wait till output is gone */
(void) fclose(fd);
}
#endif
{
char hn[MAXHOSTNAMELEN+1];
if (gethostname(hn, sizeof(hn)) == 0)
write(1, hn, strlen(hn));
}
(void) write(1, LOGIN, sizeof(LOGIN) - 1); /* always show login prompt */
}
';
printf ("%s", domainname);
}
break;
case 'O':
{
char *dom = "unknown_domain";
char host[MAXHOSTNAMELEN+1];
struct addrinfo hints, *info = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
if (gethostname(host, sizeof(host)) ||
getaddrinfo(host, NULL, &hints, &info) ||
info == NULL)
fputs(dom, stdout);
else {
char *canon;
if (info->ai_canonname &&
(canon = strchr(info->ai_canonname, '.')))
dom = canon + 1;
fputs(dom, stdout);
freeaddrinfo(info);
}
}
break;
case 'd':
case 't':
{
/* TODO: use nl_langinfo() */
char *weekday[] = { "Sun", "Mon", "Tue", "Wed", "Thu",
"Fri", "Sat" };
char *month[] = { "Jan", "Feb", "Mar", "Apr", "May",
"Jun", "Jul", "Aug", "Sep", "Oct",
"Nov", "Dec" };
time_t now;
struct tm *tm;
(void) time (&now);
tm = localtime(&now);
if (c == 'd')
(void) printf ("%s %s %d %d",
weekday[tm->tm_wday], month[tm->tm_mon],
tm->tm_mday,
tm->tm_year < 70 ? tm->tm_year + 2000 :
tm->tm_year + 1900);
else
(void) printf ("%02d:%02d:%02d",
tm->tm_hour, tm->tm_min, tm->tm_sec);
break;
}
case 'l':
(void) printf ("%s", op->tty);
break;
case 'b':
{
int i;
for (i = 0; speedtab[i].speed; i++) {
if (speedtab[i].code == cfgetispeed(tp)) {
printf("%ld", speedtab[i].speed);
break;
}
}
break;
}
case 'u':
case 'U':
{
int users = 0;
struct utmp *ut;
setutent();
while ((ut = getutent()))
if (ut->ut_type == USER_PROCESS)
users++;
endutent();
printf ("%d ", users);
if (c == 'U')
printf ((users == 1) ? _("user") : _("users"));
break;
}
default:
(void) putchar(c);
}
}
else
(void) putchar(c);
}
fflush(stdout);
tp->c_oflag = oflag; /* restore settings */
(void) tcsetattr(0, TCSADRAIN, tp); /* wait till output is gone */
(void) fclose(fd);
}
#endif
{
char hn[MAXHOSTNAMELEN+1];
if (gethostname(hn, sizeof(hn)) == 0)
write(1, hn, strlen(hn));
}
(void) write(1, LOGIN, sizeof(LOGIN) - 1); /* always show login prompt */
}