Eric MSP Veith ha scritto:
> Hello,
>
> I've spent some time trying to figure out what that script ought to do, but I
> failed. I keep assuming that it should *set* the domain name, because of
> `[ -n ${NISDOMAIN} ] && /bin/domainname "${NISDOMAIN}"ยด, but without further
> knowledge of the AWK piece we cannot tell.
>
> ...
>
Hello all,
I'm a "normal" InitNG user (I mean, I'm not developing it), but I follow
this ML. I've tried to figure out what that AWK command does. I actually
have initng 0.6.7(-1) on my Debian, and the line in
/etc/initng/system/domainname.i was:
/usr/bin/awk '$1=="domain"&&ARGV[2]!=""{$2=ARGV[2]}{print}'
/etc/resolv.conf "${DNSDOMAIN}"
This line does the following (in pseudo code):
if (($1 == "domain") && (ARGV[2] != "")) {
$2 = ARGV[2];
print;
}
Now, what are those $1 and $2? They are the words awk strips out from
/etc/resolv.conf. My resolv.conf is:
nameserver 208.67.222.222
nameserver 208.67.220.220
Now, awk takes as default "word separator" the space character.
Therefore, in my resolv.conf, $1 would be "nameserver" and $2 would be
the ip address, for each single line.
That awk script, definitely, does the following: checks if the line
begins with "domain", if it does, it checks that $DNSDOMAIN is not empty
(ARGV[2]!=""). If it is not, it sets $2 to that $DNSDOMAIN, and prints
the edited lines.
I've tried with a "realistic" resolv.conf (since mine hasn't any
"domain" lines):
$ cat myresolv.conf
domain hanskalabs.net
nameserver 192.168.1.1
$
Then I've executed that command against my custom file:
$ awk '$1=="domain"&&ARGV[2]!=""{$2=ARGV[2]}{print}' resolv.conf web.it
domain web.it
nameserver 192.168.1.1
awk: (FILENAME=resolv.conf FNR=2) fatale: non riesco ad aprire file
`web.it' in lettura (No such file or directory)
$
As you can see from the error message, seems like ARGV[2] _MUST_ be a
file (the exact error message says: "can't open `web.it' file in reading
mode"). And, moreover, it edits only the line starting with "domain".
I think that all this could've been done with sed, and some grep maybe
(maybe only sed!).
I hope I've helped :)
> Eric
My two cents,
David
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