Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Perl script to read string from file#1 and find/replace in file#2
Top Forums Shell Programming and Scripting Perl script to read string from file#1 and find/replace in file#2 Post 302951651 by pchang on Saturday 8th of August 2015 11:37:25 PM
Old 08-09-2015
Perl script to read string from file#1 and find/replace in file#2
Hello Forum.

I have a file called abc.sed with the following commands;

s/1/one/g
s/2/two/g
...

I also have a second file called abc.dat and would like to substitute all occurrences of "1 with one", "2 with two", etc and create a new file called abc_new.dat

Code:
sed -f abc.sed abc.dat > abc_new.dat

For small files, this command works fine but for large files, it's very slow

I read that Perl might be faster in doing this kind of operation.

Can you please help me write the Perl code if you think it can work faster?

I am a newbie in Perl scripting.

Thanks and appreciate all the help you can provide.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Find/replace to new file: ksh -> perl

I have korn shell script that genretaets 100 file based on template replacing the number. The template file is as below: $ cat template file number: NUMBER The shell script is as below: $ cat gen.sh #!/bin/ksh i=1; while ((i <= 100)); do sed "s/NUMBER/$i/" template > file_${i} ((... (1 Reply)
Discussion started by: McLan
1 Replies

2. Shell Programming and Scripting

find and replace a string in a file without the use of temp file

Hi - I am looking for a replacing a string in a in multiple *.sql files in directory with a new string without using a temporary file Normally I can use sed command as below for W in ls `FILE*.sql` do sed 's/OLD/NEW/g' $W > TEMPFILE.dat mv TEMPFILE.dat $W done But Here in my... (9 Replies)
Discussion started by: raghutapal
9 Replies

3. Shell Programming and Scripting

Find and replace string from file which contains variable and path - SH

e.g. /home/$USER/.config replace it with "" (empty) Is this possible? I think you should play a bit with sharps ## and sed:b: (2 Replies)
Discussion started by: hakermania
2 Replies

4. Shell Programming and Scripting

How to find a certain string in a file and replace it with a value from another file using sed/awk?

Hi Everyone, I am new to this forum and new to sed/awk programming too !! I need to find particular string in file1(text file) and replace it with a value from another text file(file2) the file2 has only one line and the value to be replaced with is in the second column. file 1: (assert (=... (21 Replies)
Discussion started by: paramad
21 Replies

5. Shell Programming and Scripting

find string and replace with string in other file

Dear all, I need your help, I have file like this: file1:23456 01910964830098775635 34567 01942809546554654323 67589 26546854368698023653 09778 58716868568576876878 08675 86178546154065406546 08573 54165843543054354305 . .file2: 23456 25 34567 26 67589 27 (2 Replies)
Discussion started by: attila
2 Replies

6. Shell Programming and Scripting

perl- read search and replace string from the file

Dear all, I have a number of files and each file has two sections separated by a blank line. At the top section, I have lines which describes the values of the alphabetical characters, # s #; 0.123 # p #; 12.3 # d #; -2.33 # f #; 5.68 <blank line> sssssss spfdffff sdfffffff Now I... (4 Replies)
Discussion started by: sasharma
4 Replies

7. Shell Programming and Scripting

How to read file, and replace certain string with another string?

Hi all, the value in the following file is just an example. It could be a different value/network addresses. Here is my example of initial output in a file name net.txt Initial Output, net.txt The goal is to produce the following format which is to convert from CIDR to Netmask... (6 Replies)
Discussion started by: type8code0
6 Replies

8. Shell Programming and Scripting

[Need help] perl script to find the occurance of string from a text file

I have two files 1. input.txt 2. keyword.txt input.txt has contents like .src_ref 0 "call.s" 24 first 0x000000 0x5a80 0x0060 BRA.l 0x60 .src_ref 0 "call.s" 30 first 0x000002 0x1bc5 RETI .src_ref 0 "call.s" 31 first 0x000003 0x6840 ... (2 Replies)
Discussion started by: acdc
2 Replies

9. UNIX for Beginners Questions & Answers

Find and replace a string in a text file

Dear all, I want to find all the "," in my text file and then replace the commas to a tab. I found a script online but I don't know how to modify the script for my case. Any one can help? Thank you. @echo off &setlocal set "search=%1" set "replace=%2" set "textfile=Input.txt" set... (2 Replies)
Discussion started by: forevertl
2 Replies

10. Shell Programming and Scripting

Script to replace a string with pattern read from a file

I have two files blocks.txt and rules.txt. In blocks.txt i have the following entries Linux1 Linux2 Linux3 ..... Linux10 In rules.txt i have the lines where a filename pattern starts like 'blk-name.*' I want to replace 'blk-name' with the names read from blocks.txt file I tried... (2 Replies)
Discussion started by: Jag02
2 Replies

LEARN ABOUT DEBIAN

g_principal

g_principal(1)					 GROMACS suite, VERSION 4.5.4-dev-20110404-bc5695c				    g_principal(1)

NAME

       g_principal - calculates axes of inertia for a group of atoms

       VERSION 4.5.4-dev-20110404-bc5695c

SYNOPSIS

       g_principal  -f	traj.xtc  -s topol.tpr -n index.ndx -a1 axis1.dat -a2 axis2.dat -a3 axis3.dat -om moi.dat -[no]h -[no]version -nice int -b
       time -e time -dt time -tu enum -[no]w -[no]foo

DESCRIPTION

	g_principal calculates the three principal axes of inertia for a group of atoms.

FILES

       -f traj.xtc Input
	Trajectory: xtc trr trj gro g96 pdb cpt

       -s topol.tpr Input
	Structure+mass(db): tpr tpb tpa gro g96 pdb

       -n index.ndx Input, Opt.
	Index file

       -a1 axis1.dat Output
	Generic data file

       -a2 axis2.dat Output
	Generic data file

       -a3 axis3.dat Output
	Generic data file

       -om moi.dat Output
	Generic data file

OTHER OPTIONS

       -[no]hno
	Print help info and quit

       -[no]versionno
	Print version info and quit

       -nice int 19
	Set the nicelevel

       -b time 0
	First frame (ps) to read from trajectory

       -e time 0
	Last frame (ps) to read from trajectory

       -dt time 0
	Only use frame when t MOD dt = first time (ps)

       -tu enum ps
	Time unit:  fs,  ps,  ns,  us,	ms or  s

       -[no]wno
	View output  .xvg,  .xpm,  .eps and  .pdb files

       -[no]foono
	Dummy option to avoid empty array

SEE ALSO

       gromacs(7)

       More information about GROMACS is available at <http://www.gromacs.org/>.

								  Mon 4 Apr 2011						    g_principal(1)
All times are GMT -4. The time now is 10:14 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy