Many modern sed implementations support extended regular expressions (POSIX ERE) via the -E option . This is not a powerful as perl and does not support named capture groups, but should be sufficient for your requirement.
Using ERE with the sed -n option (to suppress automatic printing of pattern space) we can do:
\1 in the replace part of the substitution is referring to the first capture group the same as $1 in perl.
Sorry I don't know of a good source to learn all this stuff, I just picked it up over the years of using these products. Perhaps try searching for "learning regex" or "regular expression examples" using your favorite search engine.
I did a quick search myself and came across this quite nice regex cheat sheet, it seems to cover a lot of features and is fairly easy to use Regex Cheat Sheet
These 2 Users Gave Thanks to Chubler_XL For This Post:
Folks,
I have a bit of an issue trying to obtain some data from a csv file using PERL. I can sort the file and remove any duplicates leaving only 4 or 5 rows containing data. My problem is that the data contained in the original file contains a lot more columns and when I try ro run this script... (13 Replies)
Hi all,
I'm attempting to parse through a .bin file word by word and perform a cksum on each word using perl. I'm new to perl so I dont exactly know how to get started. Any help would be greatly appreciated. Thanks! (1 Reply)
Dear all
anyone willling to help me..i have try so many time but still failed to get the ip address for line
when i print the line is like below
Connected to 192.168.1.13
#!/usr/local/bin/perl
foreach $line(@lines){
if ($line =~ /connected to/) {
$line=~/connected to(.*?) /;
... (2 Replies)
Hi
I'm writing simple perl script to parse the ftp log as below:
Local directory now /home/user/testing
227 Entering Passive Mode (192,254,19,34,8,228).
125 Data connection already open; Transfer starting.
09-25-09 02:33PM 25333629 abc.tar
09-14-09 12:50PM 18015752... (1 Reply)
Hi anyone can help.how can i get all second column data in this log below??
x 799002577959.pdf, 25728 bytes, 51 tape blocks
x 800002357216.pdf, 25728 bytes, 51 tape blocks
x aadb090910.txt, 80424 bytes, 158 tape blocks
x tsese090909.txt, 13974 bytes, 28 tape blocks (4 Replies)
Hi,
I have the file like this:
#Contents of file 1 are:
Dec 10 12:33:44 User1 Interface: Probe
Dec 10 12:33:47 uSER1 SOME DATA
Dec 10 12:33:47 user1 Interface: MSGETYPE
Dec 10 12:34:48 user1 ID: 10.
Dec 10 12:33:55 user1 Interface: MSGTYPE
Dec 10 12:33:55 user1 Id: 9
... (1 Reply)
Hello there,
I em executing the following command in a perl script to append "\0" to the end of every line in a file:
###command start
my $cmd = qx{"C:\\gawk" '{print $0 "\\\0"}' C:\file.txt > C:\file_1.txt};
###command end
But i get the following error:
###error meaasge start... (2 Replies)
Hi Perl Guys
I have another perl question
I have the following code that i have written
Getopt::Long::config(qw( permute bundling ));
my $OPT = {};
GetOptions($OPT, qw(
ver=s
help|h
)) or die "options parsing failed";
This will allow the user to do something like... (4 Replies)
Hi folks,
I have a line in log from which I need to parse few data.
Jul 6 00:05:58 dg01aipagnfe01p %FWSM-3-106011: Deny inbound (No xlate)
From the above... I need to parse the %FWSM-3-106011: substring.
Another example
Jul 13 00:08:55 dq01aipaynas01p %FWSM-6-302010: 2 in use, 1661... (3 Replies)
The below code works great to parse out a file if the input is in the attached SNP format ">".
perl -ne 'next if $.==1; while(/\t*NC_(\d+)\.\S+g\.(\d+)()>()/g){printf("%d\t%d\t%d\t%s\t%s\n",$1,$2,$2,$3,$4,$5)}' out_position.txt > out_parse.txt
My question is if there is another format in... (10 Replies)
Discussion started by: cmccabe
10 Replies
LEARN ABOUT DEBIAN
go-show-paths-to-root
GO-SHOW-PATHS-TO-ROOT(1p) User Contributed Perl Documentation GO-SHOW-PATHS-TO-ROOT(1p)NAME
go-show-paths-to-root.pl - shows all possible paths from a term to the top
SYNOPSIS
go-show-paths-to-root.pl -id GO:0008021 ontology/gene_ontology.obo
go-show-paths-to-root.pl -names -id GO:0008021 ontology/gene_ontology.obo
DESCRIPTION
traverses DAG showing all paths (terms and intervening relationships) to the root
This script is purely file based; it needs to parse the ontology each time
Subsequent parses can be speeded up using the use_cache option
If you wish to use the GO MySQL db, see the script go-db-show-paths-to-root.pl in the go-db-perl distribution
ARGUMENTS -e ERRFILE
writes parse errors in XML - defaults to STDERR (there should be no parse errors in well formed files)
-p FORMAT
determines which parser to use; if left unspecified, will make a guess based on file suffix. See below for formats
-use_cache
If this switch is specified, then caching mode is turned on.
With caching mode, the first time you parse a file, then an additional file will be exported in a special format that is fast to parse.
This file will have the same filename as the original file, except it will have the ".cache" suffix.
The next time you parse the file, this program will automatically check for the existence of the ".cache" file. If it exists, and is more
recent than the file you specified, this is parsed instead. If it does not exist, it is rebuilt.
DOCUMENTATION
<http://www.godatabase.org/dev>
perl v5.14.2 2010-05-12 GO-SHOW-PATHS-TO-ROOT(1p)