1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
#!/bin/sh
. /etc/efingerd/log # do some logging
echo
if [ "$1" = "vanya" ]; then # special action if vanya wants to finger us
echo "What do you want?????" # from any computer
echo "Go away"
exit 0 # and finish without telling him who is logged
fi
if [ "$1" = "jzatko" ]; then # not so special action if jzatko wants to finger us
echo "Hellooooooooooooooo"
echo
fi
if [ "$1" = "matos" ]; then # this user likes short listings
who -q
exit 0
fi
if [ "$2" = "pascal.fmph.uniba.sk" ]; then # ban the whole computer pascal
echo "Sorry, we do not want you to know who is here."
exit 0
fi
if [ "$1@$2" = "linus@transmeta.com" ]; then
# a very special occasion
# you should put here site specific action
# this here is just an example:
cat <<EOM
Unable to handle kernel paging request at virtual address c8848ffc
current->tss.cr3 = 00ff1000, %cr3 = 00ff1000
*pde = 0009e067
*pte = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<0018596b>]
EFLAGS: 00010297
eax: 08848ffc ebx: ffffffff ecx: 08848ffc edx: fffffffe
esi: ffffffff edi: 07230073 ebp: 00000000 esp: 07150ed4
ds: 0018 es: 0018 fs: 002b gs: 002b ss: 0018
Process cat (pid: 526, process nr: 35, stackpage=07150000)
Stack: 00389ad8 00000062 00000007 07230000 00000000 00000061 00000004 ffffffff
0000001b 00000001 00185b14 07230062 0018641e 07150f28 0010ca43 07230062
00186410 00000007 00000001 00000020 08848ffc 00000000 07150f90 00001000
Call Trace: [<00185b14>] [<0010ca43>] [<08848ffc>] [<0015c9b6>] [<0015cc26>] [<001236e0>] [<0010a8a9>]
Code: 80 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 89 c6 f7 c5 10 00
EOM
exit 0
fi
if [ "$1" = "(null)" ]; then
echo Hello "$2", # we do not know who it is - does not run ident
else
echo Hello "$1@$2", # else greet him
fi
echo users currently logged in are:
echo
who -uHw # and display the user listing in readable form
# or:
# finger # classical alternative
# or:
# ps aux # this reveals too much - do not use this command, unless
# you trust people who finger you
echo
|
