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22e155fc | 1 | /* |
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2 | * Copyright (c) 1987 Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
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6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
22e155fc DF |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
35901a68 | 20 | "@(#) Copyright (c) 1987 Regents of the University of California.\n\ |
22e155fc | 21 | All rights reserved.\n"; |
35901a68 | 22 | #endif /* not lint */ |
22e155fc DF |
23 | |
24 | #ifndef lint | |
5e8b0e60 | 25 | static char sccsid[] = "@(#)printenv.c 5.3 (Berkeley) %G%"; |
35901a68 | 26 | #endif /* not lint */ |
22e155fc | 27 | |
18745775 BJ |
28 | /* |
29 | * printenv | |
30 | * | |
31 | * Bill Joy, UCB | |
32 | * February, 1979 | |
33 | */ | |
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34 | main(argc, argv) |
35 | int argc; | |
35901a68 | 36 | char **argv; |
18745775 | 37 | { |
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38 | extern char **environ; |
39 | register char *cp, **ep; | |
40 | register int len; | |
18745775 | 41 | |
35901a68 | 42 | if (argc < 2) { |
18745775 | 43 | for (ep = environ; *ep; ep++) |
35901a68 KB |
44 | puts(*ep); |
45 | exit(0); | |
46 | } | |
47 | len = strlen(*++argv); | |
48 | for (ep = environ; *ep; ep++) | |
49 | if (!strncmp(*ep, *argv, len)) { | |
50 | cp = *ep + len; | |
51 | if (!*cp || *cp == '=') { | |
52 | puts(*cp ? cp + 1 : cp); | |
53 | exit(0); | |
18745775 | 54 | } |
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55 | } |
56 | exit(1); | |
18745775 | 57 | } |