11-15-2006
"next" and "gsub" in awk
Yesteray I post a topic talking about log processing, thanks aigles for giving me the script, the first time I heard "next" and "gsub" function, so I decided to do some test work, but I failed, and don't know why
The logfile as follow, notice line 2 contains an username
*snip*
Nov 9 10:12:01 testfirewall root: [ID 702911 local5.info] 0:00:11 accept testfw01-hme0 >hme0 proto: icmp;
src: test001.example.net; dst: abc.dst.net; rule: 1; icmp-type: 8; icmp-code: 0; product: VPN-1 & Fire
Nov 9 10:12:54 testfirewall root: [ID 702911 local5.info] 0:23:54 accept testfw01-hme0 >hme0 proto: tcp; src: maa.example.net; dst: NYCMNYZRHN0.dst.net; service: cerent_1080; s_port: 1649; rule: 30; user: abc; len: 44; srcname: abc.example.net; product: VPN-1 & FireWall-1
*snip*
the request
"find16 column doesn't contain 192.1 or 192.2 or deve"
AND
"there is "user" keyword appears in the log"
AND
delete all the ";" character in the log
my though was like this
gawk 'BEGIN {OFS = "\t"} $16!~"192.(1|2)|deve" && $0~"user" {next} gsub(/;/,"") {print $0}' fw.log
But the script work incorrectly, and I noticed when I just use the first part of the awk program,
gawk 'BEGIN {OFS = "\t"} $16!~"192.(1|2)|deve" && $0~"user"' fw.log
there was no problem, every line match the criterion I defined, but when I add
" {next} gsub(/;/,"") " seemed awk process the logfile totally different, the output result even did not contain "user", I tried to delete "next", still same.
I tried comp.awk.faq, but no information related to "next" function.
So please give me some direction what's wrong with my script? and what exactly "next" do in awk. Thank you!
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IGAWK(1) Utility Commands IGAWK(1)
NAME
igawk - gawk with include files
SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ...
igawk [ all gawk options ] [ -- ] program-text file ...
DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).
AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like
@include getopt.awk
in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.
OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports.
EXAMPLES
cat << EOF > test.awk
@include getopt.awk
BEGIN {
while (getopt(ARGC, ARGV, "am:q") != -1)
...
}
EOF
igawk -f test.awk
SEE ALSO
gawk(1)
Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.
AUTHOR
Arnold Robbins (arnold@skeeve.com).
Free Software Foundation Nov 3 1999 IGAWK(1)