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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.
 

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LEARN ABOUT DEBIAN

sdpa

SDPA(1) 						      General Commands Manual							   SDPA(1)

NAME

       SDPA - High-performance software package for SemiDefinite Programs

SYNOPSIS

       sdpa DataFile OutputFile [InitialPtFile] [-pt parameters] [-dimacs] [-numThreads  numThreads]
       sdpa [options] files...
       sdpa --version

DESCRIPTION

       sdpa  - "SDPA (SemiDefinite Programming Algorithm)" is one of the most efficient and stable software packages for solving SDPs based on the
       primal-dual interior-point method.

       SDP (SemiDefinite Program) is used for financial engineering, machine learning, control theory, sensor network problem, quantum	chemistry,
       quantum information, combinatorial optimizaiton, polynomial optimization, and so on.

       Futher information on SDP and SDPA can be found at
       http://sdpa.sourceforge.net/

OPTIONS

       ---- option type 1 ----
       sdpa DataFile OutputFile [InitialPtFile] [-pt parameters] [-dimacs] [-numThreads numThreads]
       parameters = 0 default, 1 fast (unstable), 2 slow (stable)
       example1-1: sdpa example1.dat example1.result
       example1-2: sdpa example1.dat-s example1.result
       example1-3: sdpa example1.dat example1.result example1.ini
       example1-4: sdpa example1.dat example1.result -pt 2
       example1-5: sdpa example1.dat example1.result -dimacs
       example1-6: sdpa example1.dat example1.result -numThreads 4
       ---- option type 2 ----
       sdpa [option filename]+
	 -dd : data dense :: -ds : data sparse
	 -id : init dense :: -is : init sparse
	 -o  : output	  :: -p  : parameter
	 -pt : parameters , 0 default, 1 fast (unstable)
			    2 slow (stable)
       example2-1: sdpa -o example1.result -dd example1.dat
       example2-2: sdpa -ds example1.dat-s -o example1.result -p param.sdpa
       example2-3: sdpa -ds example1.dat-s -o example1.result -pt 2
       example2-4: sdpa -ds example1.dat-s -o example1.result -dimacs
       example2-5: sdpa -ds example1.dat-s -o example1.result -numThreads 4
       ---- option type 3 ----
       sdpa --version
       to print out version and exit.

       PARAMETER_FILE
	      is decided by the following priority
		 1: The file assigned by '-p' option of 'option type 2'.
		     For 'option type1', this is skipped.
		 2: ./param.sdpa
		     For 'option type2', this is skipped.
		 3: /usr/share/sdpa/param.sdpa
		 4: Default parameter

       -dimacs
	      printout dimacs information incurring additional computation cost

       -numThreads
	      number of pthreads for internal computation

AUTHOR

       SDPA was written by SDPA Project <sdpa-developers@lists.sourceforge.net>.

       This manual page was written by Makoto Yamashita <Makoto.Yamashita@is.titech.ac.jp>.

								   July 28, 2011							   SDPA(1)
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