11-10-2002
Please visit the forum on "UNIX Standards" at the bottom on the home page for a link to the Open Group.
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
What is posix? What is the relation between Posix, Unix and linux? (1 Reply)
Discussion started by: darbarilal
1 Replies
2. Programming
can somebody explain about the ANSI C vs POSIX. say i was using open and fopen, i know that open is POSIX, and fopen is ANSI C. i read that that POSIX is a system call and ANSI C is like a standard library function. wouldn't the fopen function has to call on open function anyway to open any kind... (2 Replies)
Discussion started by: bb00y
2 Replies
3. BSD
Hi! Everybody%)
I got a question like this: Does my FreeBSD5.1 support Posix queues.
Thanks! (7 Replies)
Discussion started by: kamazi
7 Replies
4. Programming
HI,
When i am configuring php in SUN Solaris. I am getting the below error.
configure: error: Your system seems to lack POSIX threads.
Do i need to install POSIX? If so can somebody let me know where can i download POSIX for Solaris 8?
Thanks, (2 Replies)
Discussion started by: Krrishv
2 Replies
5. UNIX for Advanced & Expert Users
Hi,
consider the code below:
#include <stdio.h>
.
.
struct myStruct
{
char *message ;
int id;
};
.
.
.
void *thread_function( void *ptr );
nt main()
{
pthread_t thread1, thread2 ,thread3 ;
struct myStruct nico1; (2 Replies)
Discussion started by: Behnaz
2 Replies
6. What is on Your Mind?
Hi everybody,
i couldn't think of any better place to ask this question.
Does LINUX totally confirm with ALL of the POSIX standards??. If not which areas does it diverge??
my apologies if this questions seems sooo stupid to some of you..
thanks (0 Replies)
Discussion started by: abhiram7
0 Replies
7. Programming
in a single main() function,so need signal handling. Use Posix Message Queue IPC mechanism , can ignore the priority and other linked list message,to implement the scenario:
client:Knock Knock
server:who's there
client: Eric
Server:Eric,Welcome.
client:exit
all process terminated
... (1 Reply)
Discussion started by: ouou
1 Replies
8. UNIX for Dummies Questions & Answers
Hello, I have a question regarding ACLs and their availability across different Unix platforms via NFS share.
If I have an AIX/FreeBSD/Solaris/HP-UX client that has an nfs share from a different system mounted on it, will the ACLs on the nfs share be processed properly?
My guess is that as... (2 Replies)
Discussion started by: bstring
2 Replies
9. OS X (Apple)
Thanks to all you guys about posix compliance I have learnt an enormous amount over the last few days.
I have written a program that is an Egg Timer with simple animation.
I now realise how sophisticated 'bash' is compared to full posix compliance.
The code below has passed all of the tests from... (11 Replies)
Discussion started by: wisecracker
11 Replies
newgrp(1) General Commands Manual newgrp(1)
NAME
newgrp - switch to a new group
SYNOPSIS
[group]
DESCRIPTION
The command changes your group ID without changing your user ID and replaces your current shell with a new one.
If you specify group, the change is successful if group exists and either your user ID is a member of the new group, or group has a pass-
word and you can supply it from the terminal.
If you omit group, changes to the group specified in your entry in the password file,
Whether the group is changed successfully or not, or the new group is the same as the old one or not, proceeds to replace your current
shell with the one specified in the shell field of your password file entry. If that field is empty, uses the POSIX shell, (see sh-
posix(1)).
If you specify (hyphen) as the first argument, the new shell starts up as if you had just logged in. If you omit the new shell starts up
as if you had invoked it as a subshell.
You remain logged in and the current directory is unchanged, but calculations of access permissions to files are performed with respect to
the new real and effective group IDs.
Exported variables retain their values and are passed to the new shell. All unexported variables are deleted, but the new shell may reset
them to default values.
Since the current process is replaced when the new shell is started, exiting from the new shell has the same effect as exiting from the
shell in which was executed.
EXTERNAL INFLUENCES
International Code Set Support
Characters from the 7-bit USASCII code set are supported in group names (see ascii(5)).
DIAGNOSTICS
The command issues the following error messages:
Your user ID does not qualify as a group member.
The group name does not exist in
If a password is required, it must come from a terminal.
Standard input is not a terminal file,
causing the new shell to fail.
EXAMPLES
To change from your current group to group without executing the login routines:
To change from your current group to group and execute the login routines:
WARNINGS
There is no convenient way to enter a password into
The use of group passwords is not recommended because, by their very nature, they encourage poor security practices. Group passwords may
be eliminated in future HP-UX releases.
If the specified group to has multiple inconsistent entries (i.e. the group id or/and password are different) in the group database, will
consider the group id and password of the first matched group entry as the correct group id and password for the group.
FILES
System group file
System password file
SEE ALSO
csh(1), ksh(1), login(1), sh-posix(1), group(4), passwd(4), environ(5).
STANDARDS CONFORMANCE
newgrp(1)