hello,
I have wrote a multi thread application to run under uclinux.
the problem is that threads does not share data. using the ps command it shows a single process for each thread.
I test the application under Ubuntu 8.04 and Open Suse 10.3 with 2.6 kernel and there were no problems and also... (8 Replies)
I have a unix directory where a million of small text files getting accumulated every week.
As of now there is a shell batch program in place which merges all the files in this directory into a single file and ftp to other system.
Previously the volume of the files would be around 1 lakh... (2 Replies)
awk "/May 23, 2012 /,0" /var/tmp/datafile
the above command pulls out information in the datafile. the information it pulls is from the date specified to the end of the file.
now, how can i make this faster if the datafile is huge? even if it wasn't huge, i feel there's a better/faster way to... (8 Replies)
Hi,
I have a large number of input files with two columns of numbers.
For example:
83 1453
99 3255
99 8482
99 7372
83 175
I only wish to retain lines where the numbers fullfil two requirements. E.g:
=83
1000<=<=2000
To do this I use the following... (10 Replies)
Hi,
I have a problem where I need to make this input:
nameRow1a,text1a,text2a,floatValue1a,FloatValue2a,...,floatValue140a
nameRow1b,text1b,text2b,floatValue1b,FloatValue2b,...,floatValue140b
look like this output:
nameRow1a,text1b,text2a,(floatValue1a - floatValue1b),(floatValue2a -... (4 Replies)
I have the below command which is referring a large file and it is taking 3 hours to run. Can something be done to make this command faster.
awk -F ',' '{OFS=","}{ if ($13 == "9999") print $1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12 }' ${NLAP_TEMP}/hist1.out|sort -T ${NLAP_TEMP} |uniq>... (13 Replies)
I have nginx web server logs with all requests that were made and I'm filtering them by date and time.
Each line has the following structure:
127.0.0.1 - xyz.com GET 123.ts HTTP/1.1 (200) 0.000 s 3182 CoreMedia/1.0.0.15F79 (iPhone; U; CPU OS 11_4 like Mac OS X; pt_br)
These text files are... (21 Replies)
Discussion started by: brenoasrm
21 Replies
LEARN ABOUT MOJAVE
english5.18
English(3pm) Perl Programmers Reference Guide English(3pm)NAME
English - use nice English (or awk) names for ugly punctuation variables
SYNOPSIS
use English;
use English qw( -no_match_vars ) ; # Avoids regex performance penalty
# in perl 5.16 and earlier
...
if ($ERRNO =~ /denied/) { ... }
DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get
triggered just by accessing them (like $0) will still be affected.
For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be
referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module.
See perlvar for a complete list of these.
PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if
your code is to run on perl 5.18 or earlier.
This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters
in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing
use English qw( -no_match_vars ) ;
. It is especially important to do this in modules to avoid penalizing all applications which use them.
perl v5.18.2 2014-01-06 English(3pm)