Sponsored Content
Full Discussion: Looking to optimize code
Top Forums Shell Programming and Scripting Looking to optimize code Post 302963237 by MadeInGermany on Saturday 26th of December 2015 01:39:38 PM
Old 12-26-2015
At least you can avoid the execution of cat; awk can directly read the file.
It is a bit strange that your file seems to be a log file - what happens if it has more than one line?
The following efficient shell builtin reads one line into three variables
Code:
read DATE TIME STATE  < /opt/scripts/start.log

Might need some little post processing...

Last edited by MadeInGermany; 12-26-2015 at 03:19 PM.. Reason: changed order
 

10 More Discussions You Might Find Interesting

1. 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

2. 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

3. Shell Programming and Scripting

Optimize shell code

#!/usr/bin/perl use strict; use warnings; use Date::Manip; my $date_converted = UnixDate(ParseDate("3 days ago"),"%e/%h/%Y"); open FILE,">$ARGV"; while(<DATA>){ my @tab_delimited_array = split(/\t/,$_); $tab_delimited_array =~ s/^\ =~ s/^\-//; my $converted_date =... (2 Replies)
Discussion started by: sandy1028
2 Replies

4. Shell Programming and Scripting

pl help me to Optimize the given code

Pl help to me to write the below code in a simple way ... i suupose to use this code 3 to 4 places in my makefile(gnu) .. **************************************** @for i in $(LIST_A); do \ for j in $(LIST_B); do\ if ;then\ echo "Need to sign"\ echo "List A = $$i , List B =$$j"\ ... (2 Replies)
Discussion started by: pk_arun
2 Replies

5. 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

6. Shell Programming and Scripting

Can someone please help me optimize my code (script searches subdirectories)?

Here is my code. What it does is it reads an input file (input.txt which contains roughly 2,000 search phrases) and searches a directory for files that contains the search phrase. The directory contains roughly 1900 files and 84 subdirectories. The output is a file (output.txt) that shows only the... (23 Replies)
Discussion started by: jl487
23 Replies

7. Shell Programming and Scripting

Optimize awk command

WARNING=${1} CRITICAL=${2} echo ${OUTPUT} | gawk -F'' ' { V = $2 R = $0 } END { for ( i = 1; i <= n; i++) { if((V > 0) && (V < V)) print R, ((V - V) / V) * 100 else if ((V > V) && (V > 0)) ... (6 Replies)
Discussion started by: SkySmart
6 Replies

8. Shell Programming and Scripting

Optimize my mv script

Hello, I'm wondering if there is a quicker way of doing this. Here is my mv script. d=/conversion/program/out cd $d ls $d > /home/tempuser/$$tmp while read line ; do a=`echo $line|cut -c1-5|sed "s/_//g"` b=`echo $line|cut -c16-21` if ;then mkdir... (13 Replies)
Discussion started by: whegra
13 Replies

9. Shell Programming and Scripting

Optimize awk code

sample data.file: 0,mfrh_green_screen,1454687485,383934,/PROD/G/cicsmrch/sys/unikixmain.log,37M,mfrh_green_screen,28961345,0,382962--383934 0,mfrh_green_screen,1454687785,386190,/PROD/G/cicsmrch/sys/unikixmain.log,37M,mfrh_green_screen,29139568,0,383934--386190... (7 Replies)
Discussion started by: SkySmart
7 Replies

10. 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
CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
All times are GMT -4. The time now is 10:03 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy