11-05-2003
No, this
getenv("USER");
getenv("LOGNAME");
return NULL. It does not work ...
(I use LinuxRH7.2)
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
hi all,
kindly let me know the command to get password and user for current user in unix.
thanks in advance.
--Bali Reddy.Y (1 Reply)
Discussion started by: balireddy_77
1 Replies
2. Shell Programming and Scripting
I have crated a file xx wth env redirected into it 5 times n couldnot proceed further
n next we have to create a script that takes 1 argument being a file, in this instance we use the newly created file above xx(xx file contains the env redirected into it 5 times) read the inputted file, in... (1 Reply)
Discussion started by: bobby36
1 Replies
3. Shell Programming and Scripting
When I typed in ps -a I get this:
PID TTY TIME CMD
31799 pts/3 00:00:00 vim
31866 pts/3 00:00:00 vim
And to check who is currently logged in, I type who
Felix Whoals
Tada Whoals
Lala Whoals
How can I get the user process for all current users who logged in?? I think I need to combine... (14 Replies)
Discussion started by: felixwhoals
14 Replies
4. UNIX for Dummies Questions & Answers
I'm trying to write a grep command that will be good for the current user of the command but it doesn't work on my server with bash shell. On the server with tcsh I used:
last | grep "$user" and the current user could see how many times they logged on this month. On the other server it doesn't... (11 Replies)
Discussion started by: steveu
11 Replies
5. Shell Programming and Scripting
Ok, so, in order to install some dependencies of a program I made, a script has to be run as root. The thing is that I have to copy some things into the home folder of currently logged in user, but the variable $HOME returns '/root' and the $USER returns 'root' :(
Is there any way to see who is... (7 Replies)
Discussion started by: hakermania
7 Replies
6. Shell Programming and Scripting
Hey guys
I need a script that reads a login name and verifies if that user is currently logged in
i have found few commands like "who" and "users"
but i wonder how can i verify it that login name is logged in or not? (3 Replies)
Discussion started by: nishrestha
3 Replies
7. Shell Programming and Scripting
Hi Every body,
I would need a shell script program to login as different user and perform some copy commands in the script.
example: Supppose ora_toms is the active user
ora_toms should be able to run a script where user: ftptomsp pass: XXX should login through and run the commands
... (9 Replies)
Discussion started by: ujjwal27
9 Replies
8. Shell Programming and Scripting
Hi,
'ps -ef' returns output of the following format
UID PID PPID C STIME TTY TIME CMD
root 17573 1 0 Sep12 tty6 00:00:00 /sbin/mingetty tty6
hpsmh 18150 14864 0 Sep12 ? 00:00:00 /opt/hp/hpsmh/sbin/hpsmhd -DSSL -f /opt/hp/hpsmh/conf/smhpd.conf
root ... (3 Replies)
Discussion started by: ysrini
3 Replies
9. UNIX for Dummies Questions & Answers
In any non-root account, whenever I enter mail, it gives me:
/var/spool/mail/root: Permission deniedI am not logged in as root, why is mail accessing root's mailbox ?
I am unable to enter the currently logged in user's mailbox.
Any help is appreciated :) (2 Replies)
Discussion started by: Hijanoqu
2 Replies
10. Shell Programming and Scripting
Hi,
i need to list the processes running only under current logged in user.
EX:
$ whoami
oraaqw
$ ps -ef | grep tnslsnr
oraaqw 11403300 19267592 0 09:14:47 pts/3 0:00 grep tnslsnr
oraaqw 15794208 1 0 Jan 14 - 11:59... (6 Replies)
Discussion started by: aravindadla
6 Replies
LEARN ABOUT DEBIAN
secure_getenv
GETENV(3) Linux Programmer's Manual GETENV(3)
NAME
getenv, secure_getenv - get an environment variable
SYNOPSIS
#include <stdlib.h>
char *getenv(const char *name);
char *secure_getenv(const char *name);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
secure_getenv(): _GNU_SOURCE
DESCRIPTION
The getenv() function searches the environment list to find the environment variable name, and returns a pointer to the corresponding value
string.
The GNU-specific secure_getenv() function is just like getenv() except that it returns NULL in cases where "secure execution" is required.
Secure execution is required if one of the following conditions was true when the program run by the calling process was loaded:
* the process's effective user ID did not match its real user ID or the process's effective group ID did not match its real group ID (typ-
ically this is the result of executing a set-user-ID or set-group-ID program);
* the effective capability bit was set on the executable file; or
* the process has a nonempty permitted capability set.
Secure execution may also required if triggered by some Linux security modules.
The secure_getenv() function is intended for use in general-purpose libraries to avoid vulnerabilities that could occur if set-user-ID or
set-group-ID programs accidentally trusted the environment.
RETURN VALUE
The getenv() function returns a pointer to the value in the environment, or NULL if there is no match.
CONFORMING TO
getenv(): SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
secure_getenv() is a GNU extension.
VERSIONS
secure_getenv() first appeared in glibc 2.17.
NOTES
The strings in the environment list are of the form name=value.
As typically implemented, getenv() returns a pointer to a string within the environment list. The caller must take care not to modify this
string, since that would change the environment of the process.
The implementation of getenv() is not required to be reentrant. The string pointed to by the return value of getenv() may be statically
allocated, and can be modified by a subsequent call to getenv(), putenv(3), setenv(3), or unsetenv(3).
The "secure execution" mode of secure_getenv() is controlled by the AT_SECURE flag contained in the auxiliary vector passed from the kernel
to user space.
SEE ALSO
clearenv(3), getauxval(3) putenv(3), setenv(3), unsetenv(3), capabilities(7), environ(7)
COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2012-08-14 GETENV(3)