Date: Sat, 26 Jun 1999 22:17:22 +0800 From: Peihan Wang <peihanw@mx.cei.gov.cn> To: freebsd-questions@FreeBSD.ORG Subject: char* getenv(const char*) (3) Message-ID: <3774E0F2.66FECA2D@mx.cei.gov.cn>
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I am writing a simple program which calling
lib function getenv().
But there is something I can not explain.
The code
char * cp = getenv("PATH");
works fine,
while other two usage
cp = getenv("PPID");
cp = getenv("PIPESTATUS");
just return NULL.
Under shell(bash2.01), I type
$ set
...
PATH=/sbin:/usr/sbin:/bin:/usr/bin....
PIPESTATUS=([0]="0")
PPID=258
...
$ echo $PPID
258
$ echo $PIPESTATUS
0
Why getenv does not work with PPID & PIPESTATUS ?
How shell obtain these info ?
Thanx.
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