in reply to Re: sed command with variable in perl
in thread sed command with variable in perl

Hi samira_saber. First things first: Please edit your reply to add code tags around your code! Please see Markup in the Monastery and Writeup Formatting Tips; also see How do I change/delete my post? for general node-editing etiquette.

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Re^3: sed command with variable in perl
by samira_saber (Novice) on Aug 16, 2017 at 05:14 UTC
    Hi AnomalousMonk

    ....... using warning; first of all , i used that line before ( use strict; use warning;) at the top of my Perl code and for this reason I omit them. I think i should explain a little bit about my code. I have to m file (from matlab) and I just want to make them work automate as a software. I am very very new into Perl. For this reason I used linux shell commands and it worked fine. Now , There is problem with my code.

    .... File name argument I will put my file name in the correct place , thank you.

    ..... substitution operation without something to substitute As i mentioned before, I have two files each of them has spciefic SOL number which I used grep command to count them and then use it as a variable. $cmd =("grep -e HW1 myhalf1.pdb | wc -l > text1.txt") ; open FILE, "<text1.txt"; my $sol1= do {local $/; <FILE>}; print p ("sol1=$sol1"); As you see I have it before. in the code, which you had posted i just omit this line my $sol1 = 'my new stuff'; because i introduce my variable before. and the next line which have $sol1 is remained intact. s{ (SOL) ^\n* }{$1 $sol1}xmsg;

    ......about errors i ve added the code into my .pl file and run it. After that I check error_log file in the server and there is no warning. I have just changed the line into this my $filename_in = ''; no error.even not making another file. and i ve checked the file permission problem about the permission.


      #!/usr/bin/perl use strict; use warnings; my $filename_pdb = 'myhalf1.pdb'; my $filename_in = ""; my $filename_out = "$"; open my $fh_pdb, '<', $filename_pdb or die "opening '$filename_pdb': $!"; my $sol1 = grep /HW1/,<$fh_pdb>; close $fh_pdb; print "\$sol1 = $sol1\n"; open my $fh_in, '<', $filename_in or die "opening '$filename_in': $!"; open my $fh_out, '>', $filename_out or die "opening '$filename_out': $!"; print "processing '$filename_in' \n"; my $count = 0; while (<$fh_in>) { if ( s/SOL .*/SOL $sol1/g ){ # change as required ++$count; } print $fh_out $_; } close $fh_in; close $fh_out; print "$count lines changed\n";
        Dear AnomalousMonk, Yes it worked, and I am so happy. Thank you for your big help. I cant believe that it is solved finally. It is more than one week which I try different solutions and you did it.