Date: Sun, 10 Sep 2017 21:00:15 +0200 From: Polytropon <freebsd@edvax.de> To: Ernie Luzar <luzar722@gmail.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: awk help Message-ID: <20170910210015.eaee44cd.freebsd@edvax.de> In-Reply-To: <59B53ED2.3000409@gmail.com> References: <59B53ED2.3000409@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Allow me a few comments regarding sh -> awk for reformatting
your input data.
On Sun, 10 Sep 2017 09:32:02 -0400, Ernie Luzar wrote:
> # Locate and replace carriage return with blank.
> line=`echo -n "${line}" | tr '\r' ' '`
Drop the ^Ms in a pipe step ... | tr -d '\r' | ...
> # Locate and replace tab with blank.
> line=`echo -n "${line}" | tr '\t' ' '`
No need, awk defaults to tab(s) and/or space(s) as field
separators, and you can easily access the fields with $1,
$2, $3 and so on.
> # Drop blank lines.
> blank_line=`echo -n $line | cut -c 1-1`
> if [ "$blank_line" = " " ]; then
> continue
> fi
Just add a rule (length > 0) infront of your { ... awk
statements for each line }.
> # Drop lines with localhost in it.
> localhost=`echo -n $line | cut -w -f 2`
> if [ "$localhost" = "localhost" ]; then
> continue
> fi
Expand the rule like (length > 0 && $2 != "localhost") { ... },
in case "localhost" is the exact text; if you want to use a
reges, use $2 != /localhost/ instead.
> # Drop line with # in cloumn 1 as a comment.
> comment1=`echo -n $line | cut -c 1-1`
> if [ "$comment1" = "#" ]; then
> continue
> fi
Add another rule as reges !/^#/ && ( ... as above ... ) { ... }
to filter those. Or, also possible, use ... | grep -v "^#" | ...
infront of awk.
> # Drop line with word Malvertising starting in cloumn 1
> comment1=`echo -n $line | cut -w -f 1`
> if [ "$comment1" = "Malvertising" ]; then
> continue
> fi
See above.
> # Out put record.
> ip=`echo -n $line | cut -w -f 1`
> $trace_on echo "ip = ${ip}"
> if [ "$ip" = "127.0.0.1" -o "$ip" = "0.0.0.0" ]; then
> domain_name=`echo -n $line | cut -w -f 2`
> echo "local-zone: \"${domain_name}\" always_nxdomain" >> $host_out
> continue
> else
> domain_name=`echo -n $line | cut -w -f 1`
> echo "local-zone: \"${domain_name}\" always_nxdomain" >> $host_out
> fi
Construct an output statement as desired. Use variables instead
of $1, $2, $3 if the whole things gets too complex, for example
like this (not tested, just for illustration):
#!/bin/sh
cat input.txt | tr -d '\r' | awk '
!/^#/ && (length > 0) {
ip = $1
host = $2
if (!(host == "localhost" || ip == "127.0.0.1" || ip == "0.0.0.0"))
printf("local-zone: \"%s\" always_nxdomain\n", ip)
else
printf("local-zone: \"%s\" always_nxdomain\n", host)
}' > output.txt
That should be basically what you need. You now just have to
combine the moving parts correctly. :-)
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20170910210015.eaee44cd.freebsd>