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6.2

Any Script to Change One Line in a File

Asked by BogoJoker in Unix Systems Programming, Linux Programming, Perl Programming Language

Tags: change, file, script, line, one

I want to edit one line in a file on my computer.  All i do is simply put a '>' character on the line that has the word "three" on it (lets assume there is only one line).  I have to do this often so I want to make this as easy as possible to do, be it a shell script, a bash script, or a single command that I can alias.  Here is an example:

example.txt (BEFORE)
one
two
three
four

example.txt (AFTER)
one
two
> three
four


What I have: simple.pl (it does work)
#!/usr/bin/perl
use warnings;
use strict;

# Vars (could be command line args)
my $FILE = 'example.txt';
my $WORD = 'three';

# Generate a list of lines in the text file,
# and add the '>' to the line with WORD
open(IN, $FILE) or die("$!");
my @lines = <IN>;
for (@lines) {
  chomp;
  if ($_ =~ /^$WORD$/) {
    $_ = '>'.$_;
  }
}
close(IN);

# Rewrite the file with the line change
open(OUT, '>example.txt') or die("$!");
print OUT join("\n", @lines);
close(OUT);


What I want:
What other ways can this be done? Bash scripts, better perl scripts, Awk, command line only?
Be creative, I am learning shell scripting and PERL but I think there has to be a better way to do this seemingly simple task.  This is for my own learning experiences, so be as complex as you want, I look forward to it!

Thanks,
Joe P
[+][-]02/18/07 04:12 PM, ID: 18560356Assisted Solution

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[+][-]02/18/07 08:04 PM, ID: 18560977Expert Comment

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[+][-]02/18/07 09:30 PM, ID: 18561190Accepted Solution

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About this solution

Zones: Unix Systems Programming, Linux Programming, Perl Programming Language
Tags: change, file, script, line, one
Sign Up Now!
Solution Provided By: Perl_Diver
Participating Experts: 2
Solution Grade: A
 
[+][-]02/18/07 10:06 PM, ID: 18561277Assisted Solution

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[+][-]02/19/07 07:03 AM, ID: 18563254Author Comment

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[+][-]02/19/07 11:35 AM, ID: 18565276Expert Comment

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[+][-]02/19/07 11:37 AM, ID: 18565293Expert Comment

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[+][-]02/19/07 01:16 PM, ID: 18566198Author Comment

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[+][-]02/19/07 03:34 PM, ID: 18567284Expert Comment

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