Sponsored Content
Top Forums Shell Programming and Scripting Optimize a combination of commands Post 303007990 by Scott on Friday 24th of November 2017 01:09:35 PM
Old 11-24-2017
I don't see why a single awk command couldn't do all of that, although whether it would be quicker, I doubt.

And wc only returns 4 fields, at least as far as I see, so not sure what $5 in your awk gives you.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Combination Of commands

Hello All, I just wanted to know what are the different ways of using commands in combination. The most common one which i know is using pipes. Also grouping is also done like ( ls; date) where output of both the commands is displayed. Are there any other ways of combining various... (2 Replies)
Discussion started by: rahulrathod
2 Replies

2. Shell Programming and Scripting

optimize the script

Hi, I have this following script below. Its searching a log file for 2 string and if found then write the strings to success.txt and If not found write strings to failed.txt . if one found and not other...then write found to success.txt and not found to failed.txt. I want to optimize this... (3 Replies)
Discussion started by: amitrajvarma
3 Replies

3. UNIX for Dummies Questions & Answers

combination of two commands

I want to show a output like this Lee Ballancore PID TTY TIME CMD 31799 pts/3 00:00:00 vim 31866 pts/3 00:00:00 vim 2495 pts/7 00:00:00 vim 8368 pts/0 00:00:00 vim 9544 pts/2 00:00:00 ps Alistairr Rutherford PID TTY TIME CMD 8368 pts/0 00:00:00 vim 9544 pts/2 00:00:00 ps ... (3 Replies)
Discussion started by: nehaquick
3 Replies

4. Shell Programming and Scripting

can we optimize this command

can we optimize this command ? sed 's#AAAA##g' /study/i.txt | sed '1,2d' | tr -d '\n\' > /study/i1.txt; as here i am using two files ...its overhead..can we optimise to use only 1 file sed 's#AAAA##g' /study/i.txt | sed '1,2d' | tr -d '\n\' > /study/i.txt; keeping them same but it... (9 Replies)
Discussion started by: crackthehit007
9 Replies

5. Shell Programming and Scripting

Advice using cut & echo combination commands

Hi, I am cutting data from a fixed length test file and then writing out a new record using the echo command, the problem I have is how to stop multiple spaces from being written to the output file as a single space. Example: cat filea | while read line do field1=`echo $line | cut -c1-2` ... (6 Replies)
Discussion started by: dc18
6 Replies

6. Shell Programming and Scripting

Optimize the nested IF

Hi, I have to assign a value for a varaiable based on a Input. I have written the below code: if then nf=65 elif then nf=46 elif then nf=164 elif then nf=545 elif then nf=56 elif then (3 Replies)
Discussion started by: machomaddy
3 Replies

7. Shell Programming and Scripting

Looking to optimize code

Hi guys, I feel a bit comfortable now doing bash scripting but I am worried that the way I do it is not optimized and I can do much better as to how I code. e.g. I have a whole line in a file from which I want to extract some values. Right now what I am doing is : STATE=`cat... (5 Replies)
Discussion started by: Junaid Subhani
5 Replies

8. Shell Programming and Scripting

Help Optimize the Script Further

Hi All, I have written a new script to check for DB space and size of dump log file before it can be imported into a Oracle DB. I'm relatively new to shell scripting. Please help me optimize this script further. (0 Replies)
Discussion started by: narayanv
0 Replies

9. UNIX for Beginners Questions & Answers

Extract delta records using with "comm" and "sort" commands combination

Hi All, I have 2 pipe delimited files viz., file_old and file_new. I'm trying to compare these 2 files, and extract all the different rows between them into a new_file. comm -3 < sort file_old < sort file_new > new_file I am getting the below error: -ksh: sort: cannot open But if I do... (7 Replies)
Discussion started by: njny
7 Replies

10. Shell Programming and Scripting

awk or a combination of commands to read and calculate nth lines from pattern

Two numerical lines, found by either header line, need to be added and the total placed in a new-header section. Also the total should should be rounded or cut to a two decimal anynumber.XX format with the AB string added on the end. For example: The numerical lines from headers 2 and 3 are... (3 Replies)
Discussion started by: jessandr
3 Replies
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)
All times are GMT -4. The time now is 11:56 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy