How can I set users parameter by compiled file

[choijg]

HP-UX 11.X
L-Class

I need to set user parameter by compiled file.
Because user do not know what parameter was set
or which file is setted, so i tried to compile
putenv fuction.



#include
#include

void main(int argc, char *argv[])
{
putenv("USERPASS=/tmp/dir01");
system("export USERPASS");
system("echo $USERPASS");
}

when i put this compiled exec module in
user .profile user cannot login

How do i set the user parameter by compiled file.

Thanks everyone. ^^;

[Mark Grant · Accepted solution]

Seems an odd request to me but I'm sure you have good reason.

putenv should work but there is no need to do the system(export) because you have already put the thing in the environment (and as you run the export in a different shell anyway, the only reason it does anything at all is because you already exported it with putenv()) .


When you run the program try calling it with a preceding "." as in ". ./program". Because otherwise you are putting things in the environment of the program, not your running shell.

[R. Allan Hicks]

If the parameter is not secret, then put it in the .profile so that when the user logs in it is in his environment.

export USERPASS=/tmp/dir01

Then the getenv will recover it.

-or-

wrap a script around your program

#!/bin/ksh

export USERPASS=/tmp/dir01

myProgram

They run the script which sets the environment and myProgram recovers the environment variable.

[A. Clay Stephenson]

The problem is that this is a child process. Any changes you make to the child's environment are not going to be seen by the parent process. This is fundamental to UNIX design. If your .profile exec'ed this program then it could do a putenv() and then spawn a new shell that would have your environment variable defined.

[A. Clay Stephenson]

The "." (dot) command will not work in this case. The dot command will only excute shell commands not an executable.

[choijg]

Thanks everyone

I found the crypt function is Good solution
in this situation.

I set the all user environment variable and
connection password in the shell program
and encode the script. ^_^;

When i need the environment variable, I run cript ...(key?) < clear >cypher

cript will be a good solution

Thanks everyone
thanks for good answer.
Good luck to everyone.