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getenv - get an environment variable
char *getenv(const char *name);
The getenv() function searches the environment list to find the
environment variable name, and returns a pointer to the corresponding
The getenv() function returns a pointer to the value in the
environment, or NULL if there is no match.
SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
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).
clearenv(3), putenv(3), setenv(3), unsetenv(3), environ(7)
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