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I wrote a C program in Linux to set the values of environment variables using setenv, but after execution, when I run set or export, the environment variable itself seems to be unset. Why?
Here is the code snippet:
int main()
{
char *mallocPtr, *callocPtr, *reallocPtr, *memalignPtr, *vallocPtr;
struct sigaction sa;
sa.sa_handler=SIGSEGV_handler;
sigaction(SIGSEGV, &sa, NULL);
if(setenv("ENV1", "3", 1) == 0)
printf("ENV1 set to 3\n");
else
fprintf(stderr, "setenv failed on ENV1");
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To make permanent changes to the environment variables for all new accounts, go to your /etc/skel files, such as . bashrc , and change the ones that are already there or enter the new ones. When you create new users, these /etc/skel files will be copied to the new user's home directory.
The SETENV command can be used to define an environment variable and assign a value to it. The value of an environment variable can be retrieved from within the SAS session using the SYSGET function during autoexec processing. The command x setenv a/tmp; sets a=/tmp . The command x echo $a; results in the value /tmp.
Environment Variables are some special variables that are defined in shell and are needed by programs while execution. They can be system defined or user defined. System defined variables are those which are set by system and are used by system level programs.
The environment variables are set within the context of your program.
When your program exits, you're back in the context from where your program was started.
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